ZHIWHIS 939TX
ZHIWHIS 939TX Portable AM/FM/Wide FM Radio with Bluetooth and MP3 Player User Manual
Model: ZWS-939TX
Introduction
Welcome to your new ZHIWHIS 939TX portable radio. This device combines a high-sensitivity AM/FM/Wide FM receiver with Bluetooth 5.4 connectivity (both transmit and receive), and an MP3 player supporting USB and MicroSD cards. It features a built-in 2000mAh rechargeable battery, alarm clock, sleep timer, and a clear LCD display. This manual provides detailed instructions to help you get the most out of your device.

Package Contents
Please check the package contents carefully. If any items are missing or damaged, please contact your retailer.
- 1 x ZHIWHIS 939TX Portable Radio (with built-in 2000mAh Lithium Battery)
- 1 x USB-C Charging Cable
- 1 x Hand Strap
- 1 x Detachable Stand
- 1 x User Manual (Japanese, for reference)
Product Overview and Controls
Front Panel

This image shows the front of the ZHIWHIS 939TX radio, featuring the LCD display, speaker grille, and various control buttons. Key buttons include Power, Mode (BT/MP3/Radio), Tuning/Volume controls, Channel selection, and Preset functions.
Top Panel

The top panel of the radio features a USB-A port for USB flash drives and a MicroSD card slot for playing MP3 audio files. These are used for the MP3 player function.
Side Panel

The side of the radio houses the USB-C charging port, indicated by 'DC 5V'. Next to it is a charging indicator light. The 3.5mm headphone jack is also located on this side.
Rear Panel

The rear of the radio shows the slot for attaching the detachable stand, allowing the radio to be propped up for easier viewing and listening.
Antenna

The radio features a 360-degree rotatable and extendable telescopic antenna, designed to optimize signal reception for FM and Wide FM bands.
Setup
Charging the Battery
Your ZHIWHIS 939TX radio has a built-in 2000mAh rechargeable lithium-ion battery. Before first use, fully charge the device.
- Connect the provided USB-C cable to the charging port on the side of the radio.
- Connect the other end of the USB-C cable to a USB power adapter (5V/1A, not included) or a computer's USB port.
- The charging indicator light will illuminate during charging. The battery icon on the LCD display will show charging status.
- Charging typically takes approximately 4 hours for a full charge.
- When fully charged, the battery icon will show full, and the charging indicator may change or turn off depending on the charger.
Attaching the Stand and Strap
The detachable stand can be inserted into the slot on the back of the radio to prop it up on a flat surface.
The hand strap can be attached to the designated loop for easy carrying.
Operating Instructions
Power On/Off
Press and hold the Power button (
) for a few seconds to turn the radio on or off.
Mode Selection
Press the MODE/BT/MP3 button to cycle through available modes: FM Radio, AM Radio, Bluetooth (BT), and MP3 Player (USB/MicroSD).
Radio Mode (AM/FM/Wide FM)
- Select FM or AM mode using the MODE button.
- Manual Tuning: Briefly press the TUNING < or TUNING > buttons to adjust the frequency step by step. Press and hold these buttons to scan for the next available station.
- Auto Scan and Store (ATS): In radio mode, press and hold the MEMO/SCAN button. The radio will automatically scan for and store all available stations into presets.
- Recalling Presets: Briefly press the CH- or CH+ buttons to cycle through the stored preset stations.
- Manual Preset Storage: Tune to your desired station. Press the MEMO/SCAN button once. The preset number will flash. Use CH- or CH+ to select the desired preset number, then press MEMO/SCAN again to confirm.
- FM Stereo: When using headphones in FM mode, the radio will automatically switch to stereo reception for enhanced audio quality.
Bluetooth Mode
The ZHIWHIS 939TX supports Bluetooth 5.4 for both receiving (RX) and transmitting (TX) audio.
Bluetooth Receiver (RX) Mode (Playing audio from your phone to the radio)
- Switch the radio to BT mode using the MODE button. The display will show "BT" and an icon indicating it's ready for pairing.
- On your smartphone or other Bluetooth device, search for "ZWS-939TX" in the Bluetooth settings.
- Select "ZWS-939TX" to pair. Once connected, you can play audio from your device through the radio's speaker.
Bluetooth Transmitter (TX) Mode (Sending radio audio to Bluetooth headphones/speakers)
- Ensure your Bluetooth headphones or speaker are in pairing mode.
- Switch the radio to BT mode. Press and hold the BAND/BT TX button. The radio will start searching for Bluetooth receiving devices.
- Once connected, the radio's audio (from AM/FM or MP3) will be transmitted to your Bluetooth headphones or speaker.

MP3 Player Mode (USB/MicroSD)
- Insert a USB flash drive into the USB port or a MicroSD card into the MicroSD slot on the top of the radio. Ensure your audio files are in MP3 format.
- Switch the radio to MP3 mode using the MODE button. The radio will automatically start playing the first MP3 file.
- Use the CH- or CH+ buttons to skip to the previous or next track.
- Use the Play/Pause button to pause or resume playback.
- Equalizer (EQ) Settings: In MP3 mode, press the EQ button (if available, or refer to specific button for EQ) to cycle through different equalizer presets (e.g., Pop, Rock, Jazz, Classic, Bass, Normal) to customize the sound.

Volume Control
Use the VOL - and VOL + buttons to adjust the volume level.
Clock and Alarm Functions
Setting the Time
- In standby mode or while powered on, press and hold the TIME/ALARM button. The hour digits will flash.
- Use the TUNING < or TUNING > buttons to set the hour.
- Press TIME/ALARM again, and the minute digits will flash. Use TUNING < or TUNING > to set the minutes.
- Press TIME/ALARM again to confirm and exit.
Setting the Alarm
- Press and hold the TIME/ALARM button until the alarm icon appears and the hour digits flash.
- Use the TUNING < or TUNING > buttons to set the alarm hour.
- Press TIME/ALARM again, and the minute digits will flash. Use TUNING < or TUNING > to set the alarm minutes.
- Press TIME/ALARM again to confirm. You can usually choose between a buzzer alarm or radio alarm (if supported, select by pressing MODE or similar).
- To activate/deactivate the alarm, briefly press the TIME/ALARM button. The alarm icon will appear/disappear on the display.
Sleep Timer
- While the radio is on, press the SLEEP button (or TIME/ALARM repeatedly until sleep timer appears).
- Repeatedly press the SLEEP button to cycle through available sleep times (e.g., 10, 20, 30, 60, 90 minutes, or OFF). The radio will automatically turn off after the selected time.

Key Lock Function
To prevent accidental button presses, press and hold the LOCK button (if available, or a combination like MODE and PLAY) until a lock icon appears on the display. Repeat the action to unlock.
Maintenance
Cleaning
Wipe the radio's surface with a soft, dry cloth. Do not use abrasive cleaners, solvents, or strong chemicals, as they may damage the finish.
Battery Care
To prolong battery life, avoid fully discharging the battery frequently. Recharge the device regularly, especially if it will not be used for an extended period.
Store the radio in a cool, dry place away from direct sunlight and extreme temperatures.
General Care
Avoid dropping the radio or subjecting it to strong impacts.
Keep the radio away from water and high humidity.
Do not attempt to disassemble or repair the unit yourself, as this will void the warranty.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Radio does not turn on | Battery is depleted. | Charge the battery fully. |
| Poor radio reception | Weak signal; antenna not extended; interference. | Extend and rotate the telescopic antenna. Move the radio to a different location away from electronic devices that may cause interference. |
| No sound from speaker | Volume is too low; headphones are connected. | Increase the volume. Disconnect headphones if you want sound from the speaker. |
| Bluetooth device cannot pair | Radio not in pairing mode; device too far; already connected to another device. | Ensure the radio is in Bluetooth pairing mode (RX or TX). Move the device closer to the radio. Disconnect from other Bluetooth devices. |
| MP3 files not playing | Incorrect file format; USB/MicroSD not inserted correctly; corrupted files. | Ensure files are in MP3 format. Reinsert the USB drive or MicroSD card. Try different MP3 files or a different storage device. |
Specifications
| Feature | Detail |
|---|---|
| Model | ZWS-939TX |
| Frequency Range | FM: 76.0-108MHz, AM: 522-1710kHz |
| Reception Sensitivity | FM ≤ 15dB, AM ≤ 70dB |
| Preset Stations | FM: 99, AM: 99 (Total 198) |
| Max Power Consumption | ≤ 5W |
| Power Input | DC 5V/1A (USB-C) |
| Bluetooth Version | Ver 5.4 |
| Bluetooth Range | Within 10 meters |
| Speaker | φ40mm / 4Ω / 5W |
| Headphone Jack | 3.5mm |
| Battery | 2000mAh / 3.7V Lithium-ion |
| Product Dimensions | 67 × 127 × 28mm |
| Net Weight | 170g |
Warranty and Support
This product comes with a 1-year warranty from the date of purchase. If you encounter any issues or defects within this period, please contact ZHIWHIS customer support. We are committed to providing responsible assistance.
For further assistance or inquiries, please visit the official ZHIWHIS store or contact their customer service.
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