1. Introduction
Thank you for purchasing the Roxel RDR-40 Portable DAB/DAB+ FM Digital Radio. This manual provides essential information for setting up, operating, and maintaining your device. Please read it thoroughly before use.
The Roxel RDR-40 is a versatile portable radio featuring DAB/DAB+ and FM reception, Bluetooth V5.0 connectivity, USB and Micro SD card MP3 playback, a dual alarm clock function, and a 3.5mm headphone output. Its compact design and integrated rechargeable battery make it ideal for use at home or on the go.
2. Safety Information
- Do not expose the unit to rain or moisture to prevent fire or electric shock.
- Do not expose the unit to direct sunlight, very high or low temperatures, or high humidity.
- Avoid placing the unit near heat sources such as radiators, stoves, or other apparatus that produce heat.
- Use only the power adapter supplied with the unit.
- Do not attempt to open or modify the unit. Refer all servicing to qualified personnel.
- Keep the unit away from strong magnetic fields.
- Clean the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
3. Package Contents
Please check that all items are present:
- Roxel RDR-40 Digital Radio
- Micro USB Charging Cable
- Power Adapter
- User Manual
4. Product Layout and Controls

Image 4.1: Top Panel Controls. This image shows the top panel of the Roxel RDR-40 radio, featuring a large rotary dial on the left, and several buttons arranged to the right. Buttons include MENU/INFO, PRESET, ALARM, SLEEP, SNOOZE, and MODE. The rotary dial also functions as ENTER/SCAN.

Image 4.2: Side Panel Ports. This image displays the side of the Roxel RDR-40 radio, highlighting the various input/output ports. These typically include a Micro USB charging port, a USB port for media playback, a Micro SD card slot, and a 3.5mm headphone jack.
Control Functions:
- Rotary Dial / ENTER · SCAN: Rotate to navigate menus or adjust volume. Press to confirm selections or initiate a scan.
- MENU · INFO: Press to access the main menu. In radio mode, press repeatedly to cycle through station information.
- PRESET: Press to recall preset stations. Long press to save the current station as a preset.
- ALARM: Press to set or review alarms.
- SLEEP: Press to set the sleep timer.
- SNOOZE: Press to temporarily silence an active alarm.
- MODE: Press to switch between DAB, FM, Bluetooth, USB, and Micro SD modes.
- SKIP Buttons (<< / >>): Press to skip tracks in media playback or navigate stations.
5. Setup
5.1 Powering the Device
The RDR-40 can be powered by the included AC adapter or its internal rechargeable battery.
- AC Power: Connect the micro USB cable to the radio's charging port and the other end to the power adapter. Plug the adapter into a wall outlet.
- Battery Power: The internal lithium-ion battery provides up to 12 hours of playback on a full charge. To charge, connect the radio to the AC adapter. The charging indicator will show the charging status.
5.2 Initial Setup and Auto Scan
- Ensure the radio is powered on.
- Upon first use, the radio will automatically perform a full scan for available DAB/DAB+ stations and set the time and date.
- Once the scan is complete, the radio will tune to the first available station.
6. Operating Instructions
6.1 Switching Modes
Press the MODE button repeatedly to cycle through available modes: DAB Radio, FM Radio, Bluetooth, USB Playback, and Micro SD Playback.
6.2 DAB/DAB+ Radio Operation
- Switch to DAB mode using the MODE button.
- If a scan has not been performed or you wish to rescan, long press the ENTER · SCAN dial. The radio will scan for available stations.
- Rotate the Rotary Dial to browse through the list of available stations.
- Press the ENTER · SCAN dial to select a station.
- Saving Presets: Tune to your desired station. Long press the PRESET button. Rotate the Rotary Dial to select a preset number (1-20). Press ENTER · SCAN to save.
- Recalling Presets: Press the PRESET button. Rotate the Rotary Dial to select your desired preset. Press ENTER · SCAN to confirm.
- Information Display: Press the MENU · INFO button repeatedly to view information such as program type, signal strength, bit rate, frequency, and date/time.
6.3 FM Radio Operation
- Switch to FM mode using the MODE button.
- Auto Scan: Long press the ENTER · SCAN dial to automatically scan and save available FM stations.
- Manual Tuning: Rotate the Rotary Dial to manually tune to a frequency.
- Saving Presets: Tune to your desired station. Long press the PRESET button. Rotate the Rotary Dial to select a preset number (1-20). Press ENTER · SCAN to save.
- Recalling Presets: Press the PRESET button. Rotate the Rotary Dial to select your desired preset. Press ENTER · SCAN to confirm.
6.4 Bluetooth Operation
- Switch to Bluetooth mode using the MODE button. The display will show "Bluetooth Pairing" or similar.
- On your Bluetooth-enabled device (e.g., smartphone, tablet), enable Bluetooth and search for available devices.
- Select "Roxel RDR-40" from the list of devices to pair.
- Once paired, you can stream audio from your device to the RDR-40.
- Use the SKIP buttons on the radio or your connected device to control playback.
6.5 USB / Micro SD Playback
- Insert a USB drive into the USB port or a Micro SD card into the Micro SD slot. Ensure the media contains MP3 audio files.
- Switch to USB or Micro SD mode using the MODE button. The radio will automatically detect and begin playing MP3 files.
- Use the SKIP buttons to navigate between tracks.
- Rotate the Rotary Dial to adjust the volume.
6.6 Alarm Function
The RDR-40 supports two independent alarms.
- Press the ALARM button.
- Rotate the Rotary Dial to select Alarm 1 or Alarm 2, then press ENTER · SCAN.
- Follow the on-screen prompts to set the alarm time, source (DAB, FM, or Buzzer), and frequency (Once, Daily, Weekends, Weekdays).
- Press ENTER · SCAN to confirm each setting.
- When an alarm sounds, press the SNOOZE button for a temporary delay. Press the POWER button (usually integrated with the rotary dial or a separate button) to turn off the alarm.
6.7 Sleep Timer
The sleep timer allows the radio to turn off automatically after a set period.
- Press the SLEEP button.
- Rotate the Rotary Dial to select the desired sleep duration (e.g., 15, 30, 45, 60, 90 minutes, or Off).
- Press ENTER · SCAN to confirm.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the radio's surface. Do not use liquid cleaners or aerosols.
- Storage: If storing the radio for an extended period, ensure the battery is partially charged (around 50%) and store it in a cool, dry place.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Recharge the battery regularly, even if the radio is not in constant use.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power / Radio does not turn on | Battery is flat; Power adapter not connected or faulty. | Charge the battery using the supplied AC adapter. Ensure the power adapter is securely connected to both the radio and the power outlet. |
| Poor radio reception (DAB/FM) | Weak signal; Antenna not extended; Interference from other devices. | Extend the telescopic antenna fully. Try repositioning the radio. Perform a full scan for stations. Move away from other electronic devices. |
| Bluetooth pairing fails | Radio not in Bluetooth mode; Device too far; Bluetooth not enabled on source device. | Ensure the radio is in Bluetooth mode. Move the source device closer to the radio. Enable Bluetooth on your source device and search for "Roxel RDR-40". |
| USB/Micro SD playback not working | Incorrect file format; Media not inserted correctly; Corrupted files. | Ensure files are in MP3 format. Reinsert the USB drive or Micro SD card. Try a different USB drive or Micro SD card. |
| Alarm does not sound | Alarm not activated; Volume too low; Incorrect alarm settings. | Check alarm settings to ensure it is enabled and set correctly. Increase the volume. |
9. Specifications
| Feature | Detail |
|---|---|
| Brand | Roxel |
| Model Number | RDR-40 |
| Color | White |
| Tuning Technology | DAB+, FM |
| Connectivity | Bluetooth V5.0, USB, Micro SD, 3.5mm Headphone Jack |
| Special Features | SD Card Playback, Wireless Bluetooth, USB Playback, DAB Radio, Dual Alarm Clock |
| Material | Plastic |
| Finish Type | Matte |
| Total USB Ports | 1 (for media playback) |
| Compatible Devices | Android, iPhone, iPod (via Bluetooth) |
| Battery Type | Integrated Rechargeable Lithium-ion |
| Battery Life | Up to 12 hours (on a single charge) |
| Power Source | Battery Powered, AC Adapter (via Micro USB) |
| Product Dimensions (L x W x H) | 14.5 cm x 5.5 cm x 9.5 cm |
| Included Components | Power Adapter, Micro USB Cable, User Manual |

Image 9.1: Product Dimensions. This image illustrates the dimensions of the Roxel RDR-40 radio, showing its length as 14.5cm, width as 5.5cm, and height as 9.5cm.
10. Warranty and Support
Information regarding warranty coverage and customer support for the Roxel RDR-40 is not available in the provided product details. Please refer to the documentation included in your product packaging or contact Roxel customer service directly for assistance.
For further support, please visit the official Roxel website or contact their customer service department.