Introduction
Thank you for purchasing the Ruizu D25 MP3 Music Player. This device is designed to provide a versatile and high-quality audio experience, featuring a 2.4-inch IPS screen, touch controls, Bluetooth 5.0, FM radio, voice recording, e-book reading, and video playback capabilities. This manual will guide you through the setup, operation, and maintenance of your new device.
Package Contents
- 1 x Ruizu D25 MP3 Player
- 1 x USB Cable
- 1 x Wired Earphones
- 1 x User Manual

Product Overview
The Ruizu D25 is a compact and feature-rich portable media player. Key features include:
- Display: 2.4-inch TFT curved color screen (240*320 HD resolution) with touch keys.
- Audio Quality: HIFI Lossless Sound support.
- Connectivity: Bluetooth 5.0 for wireless audio.
- Built-in Speaker: For direct audio playback without headphones.
- Multi-functional: FM Radio, Voice Recorder, E-Book Reader, Video Player, Photo Viewer, World Clock, Alarm Clock, Calculator, Calendar, Electronic Dictionary, Actimeter.
- Durable Design: Metal body construction.
- Long Battery Life: Up to 10-20 hours of playback.


Setup Guide
1. Charging the Device
Before first use, fully charge your Ruizu D25. Connect the device to a power source (e.g., computer USB port or USB wall adapter) using the provided USB cable. The charging time is approximately 2 hours. The battery indicator on the screen will show charging status.
2. Power On/Off
- To Power On: Press and hold the power button (usually on the side) until the screen lights up.
- To Power Off: Press and hold the power button until a power-off prompt appears, then confirm.
3. Language Selection
Upon first power-on or after a factory reset, you may be prompted to select a language. Navigate using the touch keys and select your preferred language. The device supports over 28 languages including English, Russian, Japanese, Korean, French, German, Turkish, Italian, Hebrew, Dutch, Portuguese, Spanish, Swedish, Czech, Danish, Polish, Thai, Hungarian, Romanian, Arabic, Greek, and Indonesian.
4. Transferring Files (Music, Videos, E-books, Photos)
To transfer files to your Ruizu D25:
- Connect the MP3 player to your Windows PC using the supplied USB cable.
- The device will appear as a removable disk drive on your computer.
- Drag and drop your desired files (MP3, WAV, APE, FLAC, WMA, DRM, ACELP for audio; AMV/AVI for video; TXT for e-books; BMP, JPG for photos) into the appropriate folders on the device.
- Safely eject the device from your computer before disconnecting the USB cable.
Note: The device is compatible with Windows PCs for file transfer. Ensure your media files are in supported formats to avoid playback issues.
5. Using External Memory
The Ruizu D25 supports external memory cards (e.g., microSD cards) to expand its storage capacity. Insert a compatible memory card into the designated slot on the device. Files can be stored and accessed from the external memory.
Operating Instructions
1. Navigation and User Interface
The device features touch keys for navigation. Use the directional arrows and central selection button to browse menus and select options. The home button (usually represented by a 'U' or house icon) will return you to the main menu.
2. Music Playback
From the main menu, select "Music". You can browse your music by artist, album, genre, or all songs. Select a song to begin playback. The device supports MP3, WAV, APE, FLAC, WMA, DRM, and ACELP formats. Lyrics can be displayed if available in the file metadata.

3. Bluetooth Connectivity
To connect to Bluetooth headphones or speakers:
- Ensure your Bluetooth audio device is in pairing mode.
- On the Ruizu D25, navigate to the "Bluetooth" menu.
- The player will scan for available devices. Select your device from the list to pair.
- Once paired, audio will be routed wirelessly to your Bluetooth device.
Important: The Bluetooth function of the Ruizu D25 is designed for audio output to headphones or speakers only. It CANNOT pair with computers or mobile phones.

4. Video Playback
Select "Video" from the main menu. The device supports AMV and AVI video formats. For optimal performance, ensure videos are converted to these formats if they are not already.
Note: Bluetooth function does not support video playback audio. Use wired earphones or the built-in speaker for video sound.

5. E-Book Reading
Access "E-book" to read TXT format files. The device offers features like eye care themes, full-screen mode, and bookmarking to enhance your reading experience.

6. FM Radio
Select "FM Radio" from the main menu. You can auto-scan for stations or manually tune. Ensure wired earphones are connected as they often act as the antenna for FM reception.
Note: Bluetooth function does not support FM Radio audio. Use wired earphones or the built-in speaker for radio sound.

7. Voice Recorder
Go to "Voice Recorder" to start recording. The device supports WAV/MP3 recording formats. The built-in microphone allows for clear recordings, with a recording distance of approximately 3 meters in a straight line.

8. Other Functions
The Ruizu D25 includes several utility functions accessible from the main menu or tools section:
- Photo Viewer: View BMP and JPG image files.
- World Clock: Keep track of time in different zones.
- Alarm Clock: Set alarms for reminders.
- Calculator: Basic arithmetic functions.
- Calendar: View dates and plan your schedule.
- Electronic Dictionary: For quick word lookups.
- Actimeter: (Functionality not detailed, likely a step counter or activity tracker).

Maintenance
- Cleaning: Use a soft, dry, lint-free cloth to clean the device. Avoid using harsh chemicals or abrasive materials.
- Storage: Store the player in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity.
- Battery Care: To prolong battery life, avoid completely draining the battery frequently and do not leave it uncharged for extended periods. Charge the device regularly, even if not in use.
- Software: Keep your device's firmware updated if updates are released by the manufacturer. Check the official RUIZU website for any available updates.
Troubleshooting
- Device does not power on:
- Ensure the battery is charged. Connect the device to a power source and try again after a few minutes.
- Device not charging:
- Check the USB cable and power adapter for damage. Try a different USB port or power source. Ensure the connection is secure.
- Bluetooth not connecting to phone/PC:
- The Ruizu D25's Bluetooth is designed for audio output to headphones or speakers only. It cannot connect to computers or mobile phones.
- No sound from Bluetooth headphones:
- Ensure the headphones are properly paired and within range. Check the volume level on both the player and the headphones. Some functions like video playback and FM radio do not support Bluetooth audio output.
- Files not playing or recognized:
- Verify that the files are in a supported format (e.g., MP3, WAV, APE, FLAC for audio; AMV/AVI for video; TXT for e-books; BMP, JPG for photos). Ensure files are transferred correctly to the device's storage.
- Short battery life:
- Battery life is rated for 10-20 hours. High volume, continuous screen use, or certain functions (like video playback) can reduce battery life. Ensure the device is fully charged before use.
Specifications
| Feature | Specification |
|---|---|
| Product Model | D25 |
| DSP | ATJ2157 |
| Display Size | 2.4 inches (240*320 TFT curved color screen) |
| Dimensions (WxHxD) | 110*50*10mm |
| Body Material | Metal |
| Storage Type | Flash Memory |
| External Memory | Yes (supports microSD card) |
| Battery Specification | Lithium Battery (500mAh) |
| Battery Life | 10 - 20 hours |
| Charging Time | About 2 hours |
| Operation Mode | Touch Keys |
| Bluetooth | Yes (Bluetooth 5.0) |
| WIFI | No |
| Built-in Speaker | Yes |
| Supports FM | Yes |
| Recording Function | Yes (WAV/MP3 format) |
| EBook Reading | Yes (TXT format) |
| Audio Format Support | MP3, WAV, APE, FLAC, WMA, DRM, ACELP |
| Video Format | AMV / AVI |
| Picture Format | BMP, JPG |
| Recording Distance | About 3 meters (straight line) |
| Compatible Devices | Windows PC (for file transfer) |
| Functions | Voice Recorder, E-Book Reading, FM Radio, Bluetooth, Built-in Speaker, Photo Viewer, World Clock, Alarm Clock, Calculator, Calendar, Electronic Dictionary, Actimeter |
| Supported Languages | English, Russian, Japanese, Korean, French, German, Turkish, Italian, Hebrew, Dutch, Portuguese, Spanish, Swedish, Czech, Danish, Polish, Thai, Hungarian, Romanian, Arabic, Greek, Indonesian (28+ languages) |

User Tips
- For the best audio experience, especially with lossless formats, consider using high-quality wired earphones.
- Remember that the Bluetooth feature is for connecting to headphones/speakers only, not for file transfer or connecting to phones/computers.
- When using FM Radio, ensure wired earphones are plugged in as they serve as the antenna.
- If you experience any issues with media playback, double-check that your files are in the supported formats (e.g., AMV/AVI for video).
- Regularly back up important recordings or e-books to your computer.
Warranty and Support
For warranty information or technical support, please refer to the documentation provided at the time of purchase or contact the seller/manufacturer directly. Keep your proof of purchase for any warranty claims.





