EVISTR L157 Digital Voice Recorder

Chapter One: L157 Open Box

1) The Package Information

The original package comes with film wrap and bar code information. It includes:

• 1 x L157 Machine
• 1 x Earphone
• 1 x USB Cable (for data transfer and charging)
• 1 x VIP Card

We highly recommend registering your product on our site to receive an extended 18-month warranty, verify product authentication, and access better customer service. Registration is free. Visit www.evistr.com/vip or email support-us@evistr.com to register.

2) The Operation Guide Explain

The EVISTR L157 voice recorder features several key components:

• Earphone Jack: For connecting headphones.
• USB Socket: For charging and data transfer.
• POWER button: Switches the device on/off.
• REC: Button to start recording.
• PLAY: Button to play recordings.
• REW/FF select button: Used for rewinding or fast-forwarding.
• Vol + / Vol -: Adjusts the speaker volume.
• STOP: Saves recording or returns to the previous menu.
• MENU: Accesses menus, confirms selections, and initiates A-B repeat.

3) Quick Start Guide

• Turn ON device: Set the POWER button to the ON position. Then, press the PLAY button for two seconds to turn on the device.
• Recording: Press the REC button to begin recording.
• Save Recording: Press the STOP button to save the current recording.
• Delete Recording: Press the MENU button, navigate to 'Delete File', select 'Delete' to remove a single recording. To delete all files, go to 'Delete File', use the UP/DOWN buttons to select 'Delete All', and confirm.

4) Quick Menu Option Guide Using UP/Down Button

To select and confirm options, press the MENU (M) button.

• Change Record Format/Quality: Navigate to Menu (M) > Record Setting > Recording quality. Options include 1536kbps WAV, 128kbps MP3, and 64kbps MP3 formats.
• Voice Activated Mode (AVR mode): Navigate to Menu (M) > Record Setting > Voice-activated mode. Select ON to enable AVR mode.
• Voice Activated Level: Navigate to Menu (M) > Record Setting > Voice activated sensitivity. Select a sensitivity level from 1 to 5.
• Set Time: Navigate to Menu (M) > System setting > Date and time > Set time. Use UP/DOWN and VOL+/- buttons to adjust the time. Press M to confirm.
• Set Date: Navigate to Menu (M) > System setting > Date and time > Date. Use UP/DOWN and VOL+/- buttons to adjust the date. Press M to confirm.

5) Important Notice for Using The Device

• Do not shut down the device's power button while it is saving a recording.
• Do not scratch the recorder body.
• Typing or writing near the device while recording may capture unwanted noise.
• Do not format the device unless files have been backed up.
• Do not cut off power while formatting the device.
• Do not delete a file unless it has been backed up.
• Do not press any buttons when the device is connected to a computer.
• Use only the original micro USB cable for data transfer; not all third-party cables support data transfer.
• The 'View Playing' function only plays 10 seconds of each file and should only be used when necessary.
• The Voice Activated Function may not record very low decibel voices; use it only when needed.
• Avoid enabling the sleeper time function unless necessary, as it forces the device to shut down even during use.
• Do not pause the device for extended periods, as it will automatically shut down to save power.

Chapter Two: L157 Basic Operation Guide

1) Charging Voice Recorder

Connect the voice recorder to a computer using the enclosed USB cable for charging. Charging typically takes 1.5-2 hours. You can also use other USB power sources like wall chargers or charging docks. The charging input is 5V 500mAh.

2) Turn On Voice Recorder

To turn on the device, push the POWER button (located on the left side) to the "ON" position. The screen will light up, and the EVISTR logo will appear. To turn off the device, switch the button back to the "OFF" position.

Note: It is recommended to keep the POWER button in the ON position unless storing the device. For turning the device on/off during normal use, pressing the PLAY button is recommended.

Device Power States:

• ON: Push the power button up to the ON position.
• OFF: Push the power button down to the OFF position for a total shutdown.

3) How to Recording

To begin recording:

1. Ensure the POWER switch is in the ON position.
2. Press and hold the PLAY button to power on the voice recorder.
3. Press the REC button to start recording.
4. Press the STOP button to save the recording.

Each recording is saved with a filename including the date and time (e.g., 20180510162305.MP3). You can view file properties to see the exact recording time.

6) How to Pause and Resume Your Recording

During recording, press the PLAY button to pause. Press PLAY again to resume recording. Note: Pausing for an extended period may cause the device to automatically shut down due to the power-saving function.

7) How to Playback Recordings

To play recordings:

1. Press and hold the PLAY button to turn on the voice recorder.
2. Press the PLAY button to play the latest recording.
3. Use the UP/DOWN buttons to select other recordings for playback.

Note: If the device is in the MUSIC folder, press and hold the STOP button to switch to the RECORD folder.

8) How to Fast Forward / Rewind

During playback, press and hold the UP button to rewind or the DOWN button to fast forward.

9) How to Delete Recordings

Recordings can be deleted using several methods:

• Format the EVISTR L157 disk on a Windows computer (this erases all data).
• From your computer, navigate to the EVISTR L157 disk, find the "RECORD" folder, and delete desired recordings.
• Format the recorder directly on the device.
• Delete single files on the device via the delete mode.
• Delete all recordings on the device via the delete mode.

To delete recordings on the device:

1. Press the MENU (M) button.
2. Navigate to 'Delete File' and select 'Delete' to remove the current file.
3. Confirm your selection by pressing M.
4. To delete all files, select 'Delete All' and confirm.

10) How to Playback Music

To play music files:

1. Press the PLAY button to turn on the voice recorder.
2. Press and hold the STOP button to switch to the music folder (if currently in the recordings folder).
3. Press PLAY to begin playback of music.

Notice: If "no songs" is displayed, there are no music files on the recorder, or the file format is not supported.

11) Restore to Factory Settings

Restoring to factory default settings can resolve configuration issues. Follow these steps:

1. Turn on the device using the PLAY button.
2. Press M to access the menu.
3. Navigate to 'System Settings' using UP/DOWN buttons and press M.
4. Find and select 'Factory Settings' and press M.
5. Select 'Yes' and press M to confirm. The device will then restore settings and reboot. A "restored!" message will appear upon success.

12) Format Device

To format the device directly:

1. Turn on the device using the PLAY button.
2. Press M to access the menu.
3. Navigate to 'System Settings' using UP/DOWN buttons and press M.
4. Find and select 'Format Device' and press M.
5. Select 'Yes' to confirm the format operation.
6. Press M to confirm and start formatting. The screen will display "please wait".

Warning: Do not shut down the device during the formatting process. After completion, the device will restore settings and reboot. All data will be erased and cannot be restored.

13) How to Connect to Computer

Use the enclosed Micro USB cable to connect the voice recorder to your computer. Upon successful connection, a connection icon will appear. The device will function like a normal flash drive, allowing you to delete files, copy files to or from the recorder.

Visual Aid: Images show a computer keyboard with the voice recorder connected via USB, and a computer screen displaying "EVISTR L157 (F:)" as a removable storage device.

14) Format EVISTR L157 Drive on Computer Directly

When connected to your computer, right-click on the EVISTR L157 drive and select 'Format' to format the device.

Notice: All data will be erased completely during formatting. Back up your data before proceeding.

15) System Time & Date Setting

To set the time and date:

1. Turn on the voice recorder.
2. Press M (menu), select "System Setting", and press M.
3. Select "Date and time", and press M. The screen will display "set time" and "set date".
4. Set Time: Select 'Set time', press M. Use UP/DOWN to adjust the hour, and VOL+/- to adjust the minutes. Press M to confirm.
5. Set Date: Select 'Set date', press M. Use UP/DOWN to adjust the Year, Month, and Day. Use VOL+/- to move between fields. Press M to confirm.

16) Go to Setting (Menu Options)

At the stop recording or playback status, press M (menu) to enter the menu options. The buttons function as follows:

• UP/DOWN: For selection.
• VOL+, VOL-: For moving to the next field (e.g., in time setting).
• M (menu): For confirming selections.
• STOP: To return to the previous menu.

If you encounter issues, refer to Chapter Five (Trouble Shooting). For unresolved problems, contact support-us@evistr.com with your order ID and model number.

All products come with a 1-year warranty, and customer satisfaction is guaranteed.

Chapter Three: L157 Advanced Operation Guide

1) Record Setting

1.1 Recording Quality

You can select the recording quality from the following options: 1536kbps (WAV format), 128kbps (MP3 Format), or 64kbps (MP3 format).

1.2 Record Led

ON: The default setting, where the LED indicator light is on during recording. OFF: Turns off the LED indicator light.

1.3 Subsection Recording

This feature allows the recorder to automatically save the recording file at a selected time length and start a new recording. Options include:

• Half Hour: Records each file at 30-minute intervals.
• One Hour: Records each file at 1-hour intervals.
• Two Hour: Records each file at 2-hour intervals.
• CLOSE: Turns off the subsection recording function.

For example, selecting "Half Hour" will save a recording every 30 minutes and start a new one. To disable this, select CLOSE and confirm in the menu.

1.4 Voice Activated Recording (AVR)

What is Voice Activated Recording? When AVR mode is ON, the screen displays "VOX", indicating the device has entered voice-activated recording mode. The device records only when voice or sound is detected, reducing blank time and saving storage space. Press STOP to save recordings when using AVR mode.

AVR Mode:

• ON: Activates voice-activated recording.
• OFF: Deactivates voice-activated recording.

Voice Activated Sensitive Level: Levels 1 through 5 determine sensitivity. Level 1 requires a loud sound (above 70db), while Level 5 is highly sensitive and records even quiet sounds or ambient noise. Note: Avoid using this function for important lectures or meetings as it may miss low-decibel speech. Use regular record/stop for such events.

Level one is the least sensitive, requiring a louder voice to activate recording. Level five is the most sensitive, capturing soft speech and potentially continuous recording without pause status.

NOTICE: When AVR is ON, the screen shows "VOX". If no voice is detected, the recording time will not count, indicating a pause. Recording resumes automatically when voice is detected again. Select the MIC sensitive level according to your needs.

1.5 Record Monitor

ON: Use earphones to monitor the recording in real-time. OFF: Disables this function.

1.6 Exit

Exits the current record setting and returns to the previous menu level.

2) System Setting

2.1 Sleeper Timer

This setting forces the device to automatically switch off after a set period. Options include: OFF, 10, 30, 60, 90, and 120 minutes.

2.2 Backlight Timer

Controls how long the screen stays lit without operation. Options: 20 seconds, 30 seconds, Always on. Notice: Selecting "Always on" is not recommended as it drains the battery quickly.

2.3 Brightness

Adjusts screen brightness from dark to bright. Options range from 00 to 15. Higher numbers mean a brighter screen. Press M (menu) to confirm changes.

2.4 Date and time

Set the system time and date. Use UP/DOWN to adjust hour, minute, year, month, day. Use VOL+/VOL- to move to the next field. Remember to press M (menu) to confirm.

2.5 Language

Change the device's display language.

2.6 Information

• Player Information: Displays the device firmware version and system firmware release date.
• Disk Space: Shows the free and total built-in memory space.

2.7 Format Device

Formatting erases all data on the device permanently. Notice: Back up data before formatting. Do not cut off power during formatting, as this can cause disk errors. Wait for completion and reboot before switching off the device. If a "DISK ERROR" occurs after power loss, connect to a Windows computer, format the disk, and the device should return to normal. (For MAC users, contact customer support for assistance).

2.8 Factory settings

Restores the device to its factory default settings. If you encounter confusion with settings, this function is helpful. Enter 'Factory Settings' via the menu, select 'Yes', and confirm with M. The screen will show "Restored!" upon completion.

3) Play Setting

3.1 Play Mode

Repeat:

• Repeat off: Plays recordings in normal sequence from first to last.
• Repeat One: Repeats the currently selected track continuously.
• Repeat All: Repeats all recordings from A to Z.

Shuffle: When enabled, playback will be in random order, and UP/DOWN buttons will not select next or previous tracks.

3.2 Sound Setting

Adjust sound settings, including equalizer options like Rock, Pop, Soft, Jazz, Classical, and Techno. Select and confirm changes for them to take effect.

4) Folder View

Displays the number of folders on the recorder's disk and the types of files contained within them.

Chapter Four: Failed Connect to Computer

Experiencing connection issues with your computer is similar to problems with flash drives. Here are suggestions to fix this:

• Before connecting, switch OFF the voice recorder.
• When connecting, do not press any buttons on the recorder to avoid exiting connection mode.
• Avoid moving the Micro USB cable while connected to prevent unstable connections.
• If connection fails, try a different Micro USB cable (like a phone cable), a different USB port, or reboot your computer.
• For persistent issues, advanced debugging may be required, involving checking Computer Management and Device Manager.

If connection problems persist, please contact support-us@evistr.com for assistance.

Chapter Five: Troubleshooting

1) No Voice Recordings

If no recordings are found or all have been deleted, the screen may display "no voice recordings" or "no songs". You can proceed to press REC to start a new recording.

2) How to Close Record Light

Navigate to Record Setting > Record led > select CLOSE (OFF) to prevent the record light from illuminating or flashing during recording.

3) Format Error

Format errors can occur due to:

• Forcibly turning off the POWER BUTTON during recording, which can damage files. Always press STOP first to save recordings.
• Recordings shorter than 5 seconds (e.g., zero-second files).
• Computer incompatibility with .wav files (common with Windows 10 or MAC users). Consider downloading free media players like MplayerX (mplayerx.org) or VLC Media Player (videolan.org/vlc).
• Recording in MP3 format may offer better compatibility.

4) Disk Error

Disk errors can result from static shock, over-current charging, or power loss during formatting, leading to system firmware loss. Rescue: Keep the power button OFF, connect to a Windows computer, and format the recorder disk again. For MAC users, contact customer support.

5) How to connect to computer

Use the provided USB cable or a compatible Android phone cable to connect to your computer. If connection fails, contact support-us@evistr.com for assistance.

6) Can I delete recordings from computer

Yes. When connected, the recorder appears as a removable drive named "L157". Recordings are stored in the "RECORD" folder. You can delete or copy files just like with any USB flash drive.

7) When Connect to computer, the buttons not work

When connected, the device enters connection mode, indicated by a "CONNECTION ICON" on the screen. If you press and hold the M button, it will exit connection mode, preventing computer connection. All buttons will be unresponsive in this state.

8) Cannot find my recordings in the recorder

This issue may occur if the device is accessing the MUSIC folder. Press and hold STOP to switch back to the RECORD folder. Alternatively, connect to a computer to verify the presence of recordings.

9) How to Turn ON Voice Activated Function

Navigate to Menu Options > Record setting > Voice Activated Setting > AVR mode > ON. Press M to confirm. The screen will display "VOX" when the function is active.

10) How to Use the AVR Mode (Voice Activated Function)

When AVR mode is ON, the recorder uses voice activation. It records only loud enough sounds. Sensitivity can be adjusted from Level 1 (requires louder voice) to Level 5 (highly sensitive). When AVR is ON and REC is pressed, the device records for 3 seconds to confirm mode entry, then records only detected voice/sound.

11) Press REC, it not recording

Check the following:

• Is the recording light blinking?
• Does the screen show "VOX"? If so, consider disabling AVR mode if not needed.
• Is there sufficient free space on the device?

12) Press REC, it shows "OVER RECORD"

This indicates the memory is full or there are too many folders/recordings. This can happen from frequent recording/saving or creating many folders. Files unreadable by the recorder may also contribute. Format the voice recorder or connect it to a computer to check and format the disk.

13) Why it is only playing 10 seconds

This occurs when the "view playing" playback mode is active, which plays only 10 seconds of each file. At the playback status, press M (menu), find 'Repeat', and select 'Repeat All' or another mode, then confirm with M.

14) Why it playback in random

To resolve random playback, go to Play Setting and disable the shuffle function.

15) How to use the A-B repeat function

During playback, press and hold M. 'A' will appear on the screen, indicating the start point. Press and hold M again to select point 'B' (the end point). The device will then play back the section between A and B.

16) The recording is noise

Avoid recording near sources of noise like computers, electric fans, air conditioners, or sound bars, as the recorder may pick up static noise.

17) The recorder auto shut down when I am recording

This is caused by the "sleeper time" function being enabled. To disable it, go to System Setting > Sleeper time, select OFF, and confirm. The default setting is usually zero.

18) I Cannot Shut Off My Voice Recorder

When the recorder is charging or connected to a computer, the POWER BUTTON may not shut it off as it receives power directly from the source.

19) How to format the recorder

Navigate to Menu > System Setting > Format Device > Format Disk. Select 'Yes' and press M to confirm and start formatting. All files will be deleted, restoring the full storage capacity (e.g., 8GB). Do not shut off the device during formatting.

20) Space is full

When storage is full, connect the recorder to your computer, back up files, and then delete recordings from the recorder. Note: Directly deleting files from the recorder to the computer may not free up space successfully. The recorder has limited storage (8GB/16GB), so regular backups are necessary.

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