Introduction
Thank you for choosing the PRUNUS J-725 Portable FM Radio. This compact and versatile device features FM radio reception, an integrated MP3 player with support for SD cards and USB drives, an alarm clock, and an emergency LED light. Equipped with a 3000mAh rechargeable battery, it offers extended listening time. This manual provides detailed instructions to help you operate and maintain your radio effectively.
Product Overview
Key Features
- Compact and lightweight design (135 x 66 x 28 mm, 192g) for easy portability.
- High-capacity 3000mAh rechargeable battery providing over 30 hours of playback at low volume.
- FM radio (87.5-108 MHz) with automatic station scanning and storage for up to 99 stations.
- Integrated MP3 player supporting TF/SD cards and USB flash drives.
- Clock and alarm functions.
- Emergency LED flashlight.
- Clear sound quality from a 3W integrated speaker.
- 3.5mm headphone jack for private listening or external speaker connection.
- Charging indicator: Red for charging, Green for fully charged.
Components and Controls
Familiarize yourself with the radio's layout and controls.
Figure 1: Front and side view of the PRUNUS J-725 radio, illustrating its compact size (135mm x 66mm x 28mm) compared to a smartphone, and highlighting key controls such as the display, numeric keypad, mode button, LED light button, and USB/AUX ports.
Figure 2: Universal compatibility diagram. The radio supports FM radio, MP3 format playback from Micro SD/TF cards and USB flash drives, and audio input via AUX jack from devices like MP3/MP4 players or computers.
Setup
Charging the Battery
The PRUNUS J-725 radio is equipped with a built-in 3000mAh rechargeable lithium battery.
- Connect the provided charging cable to the radio's charging port (typically a USB port).
- Connect the other end of the cable to a compatible USB power source (e.g., USB adapter, computer, power bank).
- The charging indicator light will turn red while charging.
- Once fully charged, the indicator light will turn green. A full charge typically takes approximately 5-6 hours.
Note: Avoid overcharging the battery. Disconnect the charger once the green indicator light appears.
Figure 3: The radio's display showing battery life and the charging indicator. The 3000mAh battery provides up to 30 hours of continuous playback at 30% volume.
Operating Instructions
Power On/Off
- To power on the radio, slide the ON/OFF switch to the "ON" position.
- To power off the radio, slide the ON/OFF switch to the "OFF" position.
FM Radio Operation
The radio supports FM frequencies from 87.5 to 108 MHz.
- Ensure the radio is powered on.
- Press the MODE button until "FM" is displayed on the screen.
- To automatically scan and save available FM stations, press and hold the SCAN button (often labeled with a play/pause icon). The radio will scan and store up to 99 stations.
- To navigate through saved stations, use the Previous/Next buttons (often labeled with arrow icons).
- To directly input a station frequency, use the numeric keypad. For example, to tune to 106.2 MHz, press "1", "0", "6", ".", "2".
Note: The radio does not support manual saving of individual stations; stations are saved automatically during the scan process.
MP3 Player Operation (USB/SD/AUX)
The radio can play MP3 audio files from a USB flash drive or a TF/Micro SD card. It also supports AUX input.
- Insert a USB flash drive into the USB port or a TF/Micro SD card into the designated slot.
- Press the MODE button to switch between USB, SD, or AUX modes. The display will indicate the current mode.
- For AUX input, connect an external audio device (e.g., smartphone, MP3 player) to the 3.5mm AUX jack using an audio cable.
- Use the Play/Pause button to start or pause playback.
- Use the Previous/Next buttons to skip tracks.
Note: USB drives must be formatted to FAT32 for proper recognition.
Clock and Alarm Function
The radio includes a digital clock and an alarm function.
Figure 4: The radio displaying the time and indicating the alarm function is active. This feature provides a reliable timekeeping and wake-up solution.
- To set the time, refer to the specific instructions in the included owner's manual (if available, as detailed steps are not in JSON). Generally, this involves pressing a "TIME" or "SET" button, then using numeric keys or arrow keys to adjust hours and minutes.
- To set the alarm, locate the "ALARM" or "SET ALARM" button. Follow the on-screen prompts to set the desired alarm time and activate it.
- The alarm tone volume is typically linked to the radio's main volume setting.
Emergency LED Light
The radio features a built-in LED flashlight for emergency situations or low-light conditions.
Figure 5: The PRUNUS J-725 radio being used as an emergency LED flashlight, demonstrating its utility in dark environments such as during vehicle maintenance or power outages.
- To turn on the LED light, press the LED button.
- Press the LED button again to turn it off.
Maintenance
Cleaning
- Wipe the radio with a soft, dry cloth.
- Do not use abrasive cleaners, solvents, or strong chemicals, as these may damage the surface.
Battery Care
- Charge the battery regularly, even if the radio is not in frequent use, to maintain battery health.
- Avoid fully discharging the battery frequently.
- Store the radio in a cool, dry place when not in use for extended periods.
Storage
- Store the radio away from direct sunlight, high temperatures, and humidity.
- Keep it away from strong magnetic fields.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Radio does not power on. | Battery is depleted or not charged. | Charge the radio fully. Ensure the ON/OFF switch is in the "ON" position. |
| Poor FM reception. | Weak signal, antenna not extended, or interference. | Extend the telescopic antenna fully. Move the radio to a location with better signal. Avoid strong electromagnetic interference. |
| Cannot play MP3 from USB/SD. | Incorrect file format, unsupported storage device, or incorrect mode. | Ensure files are in MP3 format. For USB, ensure it's formatted to FAT32. Press the MODE button to select the correct input (USB or SD). |
| Charging port connection issues. | Physical damage to the port or cable. | Gently check the charging cable and port for damage. Ensure the cable is inserted correctly. If issues persist, contact customer support. |
| Alarm does not sound. | Alarm not set or volume too low. | Verify the alarm time is set correctly and the alarm function is activated. Increase the radio's volume. |
Specifications
| Feature | Detail |
|---|---|
| Brand | PRUNUS |
| Model Number | J-725 |
| Product Dimensions (L x W x H) | 13.5 x 6.6 x 2.8 cm (5.3 x 2.6 x 1.1 inches) |
| Weight | 192 Grams (0.42 lbs) |
| Power Output | 3 Watts |
| FM Frequency Range | 87.5 - 108 MHz |
| Bandwidth | 150Hz - 20KHz |
| Signal-to-Noise Ratio | > 80 dB |
| Speaker | 40MM internal magnetic speaker |
| Charging Voltage | DC 5V / 500-1000MA |
| Media Support | TF Card / USB Flash Drive (MP3 format) |
| Battery Type | Rechargeable Lithium-ion (3000mAh) |
| Charging Time | Approx. 5-6 hours |
| Playback Time | Approx. 30 hours (at ≤1/3 volume) |
| Display Type | LED / LCD |
| Connectivity | USB, AUX |
| Included Components | Owner's Manual, Charging Cable |
Warranty and Support
Warranty Information
The PRUNUS J-725 radio typically comes with a 2-year warranty. Please refer to your purchase documentation for specific terms and conditions.
Customer Support
For any questions, technical assistance, or warranty claims, please contact PRUNUS customer support. You can find more information and contact details on the official PRUNUS brand store: PRUNUS Official Store.