PRUNUS J-405 Portable Bluetooth Speaker FM Radio HI-FI MP3 Player User Manual

Introduction

The PRUNUS J-405 is a versatile portable audio device combining an FM radio, Bluetooth speaker, and MP3 player with a built-in voice recorder. Designed for portability and high-fidelity sound, it features a compact design, a rechargeable battery, and multiple playback options. This manual provides detailed instructions for setting up, operating, and maintaining your device.

PRUNUS J-405 Portable Bluetooth Speaker FM Radio HI-FI MP3 Player — Front view of the PRUNUS J-405 with digital clock display.

Key Features

HI-FI Sound: Deep bass and clear highs without distortion, delivered by a 3W internal magnetic speaker.
Multi-function Music Player: Supports Bluetooth connection, TF card, and USB drive for versatile music playback.
FM Radio: Wide frequency range (87.5-108MHz) with a 360-degree telescopic antenna and DSP chip for clear reception.
Voice Recorder: Records external sounds directly to a TF card or USB drive.
Clock & Alarm: Features a digital clock and customizable alarm tone using FM radio, USB, or TF card audio.
Portable Design: Compact size (4.72 x 1.22 x 2.76 inches, 0.52 lbs) with a carrying lanyard.
Rechargeable Battery: 1500mAh battery with USB-C charging and a charging indicator.
Headphone Jack: 3.5mm jack for private listening.

PRUNUS J-405 features list — Overview of the PRUNUS J-405's features including FM Radio, 1500mAh Rechargeable Battery, USB-C Charging, Clock, Alarm Clock, Headphone Jack, Low Battery Alert, Charging Indicator, and Customize Alarm Tone.

Setup

1. Initial Charging

Before first use, fully charge the device. Connect the included USB-C cable to the charging port on the side of the device and the other end to a standard USB power adapter (not included). The charging indicator light will illuminate during charging and turn off or change color when fully charged.

PRUNUS J-405 Extended Battery Life and USB-C Charging — Information on extended battery life, 1500mAh rechargeable battery, low battery alert, charging indicator, and USB-C charging.

2. Inserting Storage Media (TF Card / USB Drive)

To play MP3 files or use the recording feature, insert a TF (Micro SD) card or a USB flash drive into the designated slots on the side of the device. Ensure the card/drive is inserted correctly until it clicks into place.

Close-up of TF card and USB drive slots on PRUNUS J-405 — Detailed view of the TF card and USB drive insertion slots.

Operating Instructions

1. Power On/Off

Press and hold the red power button (ON/OFF) to turn the device on or off.

2. Adjusting Volume

Rotate the volume wheel located on the side of the device to adjust the audio level. Turn it towards '+' to increase volume and towards '-' to decrease.

Volume knob and earphone jack on PRUNUS J-405 — Close-up showing the volume knob and earphone jack.

3. FM Radio Operation

Extend the telescopic antenna for optimal reception.
Press the FM button to switch to FM radio mode.
Automatic Scan: Press the M button (Mode) or a dedicated scan button (if available) to automatically scan and store all available stations.
Manual Tuning: Use the number pad (0-9) to directly enter the frequency of your desired station (e.g., 94.3 for 94.3 MHz).
Use the Previous/Next buttons to navigate through stored stations or fine-tune frequencies.

PRUNUS J-405 displaying FM frequency with antenna extended — The PRUNUS J-405 showing FM frequency 94.3MHz with its telescopic antenna extended.

Hand pressing number buttons on PRUNUS J-405 — A hand demonstrating how to use the number buttons for direct station tuning.

4. Bluetooth Speaker Mode

Press the M button to switch to Bluetooth mode. The display will show "BLUE" or a Bluetooth icon.
On your smartphone, tablet, or laptop, enable Bluetooth and search for available devices.
Select "PRUNUS J-405" from the list to pair. A confirmation sound may play upon successful connection.
Use the device's playback controls (Play/Pause, Previous/Next) or your connected device to manage music.

PRUNUS J-405 functioning as a wireless Bluetooth speaker — The PRUNUS J-405 connected wirelessly to a smartphone via Bluetooth, playing music.

5. MP3 Player (USB/TF Card)

Ensure a TF card or USB drive with MP3 files is inserted.
Press the M button to cycle through modes until you reach the MP3 player mode (often indicated by a USB or TF icon).
The device will automatically start playing MP3 files. Use the Play/Pause, Previous/Next buttons to control playback.

PRUNUS J-405 Multi-function Music Player options — Diagram illustrating the three flexible ways to enjoy music: Bluetooth, USB Drive, and TF Card.

6. Voice Recording

Insert a TF card or USB drive to save recordings.
Press the REC button to start recording external sounds.
Press REC again to stop and save the recording.
Recordings are saved as audio files on the inserted storage media.

PRUNUS J-405 Recording Feature — Illustration of the recording feature, showing the device recording external sound with a microphone.

7. Clock and Alarm Function

The device displays the current time on its screen.
To set an alarm, refer to the device's specific menu options (usually accessed by a dedicated clock/alarm button or holding the M button).
You can customize the alarm tone to be an FM radio station, a song from your USB drive, or a track from your TF card.

PRUNUS J-405 Customized Alarm Tone feature — Image depicting the customized alarm tone feature, allowing selection from FM Radio, USB Drive, or TF Card.

8. Using Headphones

Plug any standard 3.5mm headphones into the earphone jack on the side of the device for private listening.

Maintenance

Cleaning: Use a soft, dry cloth to clean the device. Do not use liquid cleaners or solvents.
Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
Battery Care: To prolong battery life, avoid completely draining the battery frequently. Recharge the device regularly, even if not in use for extended periods.
Water Exposure: This device is not waterproof. Avoid exposure to water or high humidity.

Troubleshooting

Device won't turn on: Ensure the battery is charged. Connect to a power source and try again.
No sound: Check the volume level. Ensure headphones are not plugged in if you expect sound from the speaker. If headphones are used, ensure they are fully inserted.
Poor FM radio reception: Fully extend the telescopic antenna. Try repositioning the device or moving to an area with better signal.
Bluetooth not connecting: Ensure the device is in Bluetooth mode and discoverable. Make sure Bluetooth is enabled on your external device and it's within range (typically 10 meters).
MP3 files not playing: Ensure the TF card or USB drive is inserted correctly and contains compatible MP3 files. Check if the device is in the correct playback mode.
Recording not working: Verify that a TF card or USB drive is inserted and has sufficient free space. Remember, the device only records external sounds.

Specifications

Attribute	Value
Brand Name	PRUNUS
Model Number	J-405
Dimensions (WxHxD)	8.00 x 5.50 x 1.80 cm (approx. 4.72 x 1.22 x 2.76 inches)
Weight	0.52 lb
Body Material	Plastic
Screen	Yes
Power Supply	Rechargeable Battery Pack (1500mAh)
Style	Portable
Type	FM Radio, Bluetooth Speaker, MP3 Player
Function	Built-In Speaker, Built-in Amplifier, Voice Recorder, Clock, Alarm Clock
FM Frequency Range	87.5-108MHz
Speaker Output	3W
Origin	Mainland China
Certification	CE

User Tips

For the best audio experience, plug in your earphones to the 3.5mm headphone jack for a more personal 'concert-like' sound.
Utilize the carrying lanyard for convenient listening while walking or during outdoor activities.
When setting an alarm, consider customizing the tone with your favorite music from a TF card or USB drive, or a cheerful radio station to start your day refreshed.
The device's compact dimensions (8.00*5.50 *1.80 cm) make it easy to carry in a pocket or small bag.

Warranty and Support

For warranty information or technical support, please refer to the seller's policies or contact the manufacturer directly. Keep your purchase receipt for any warranty claims.

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PRUNUS J-405