Introduction
This manual provides detailed instructions for the safe and efficient operation of your Syitren R400 Vintage Portable CD Player. Please read this manual thoroughly before using the device and retain it for future reference.
What's in the Box
Verify that all items listed below are included in your package:
- CD Player
- Protective Cover
- Stand
- USB-C Charging Cable
- Earphones
- Quick Start Guide

Image: Contents of the Syitren R400 CD Player package. Includes the main unit, protective case, stand, USB-C charging cable, quick start guide, and earphones.
Product Overview
The Syitren R400 is a vintage-style portable CD player featuring Bluetooth 5.3 connectivity, a rechargeable battery, and a removable protective case. It supports various CD formats and offers both wired and wireless audio output options.

Image: Front view of the Syitren R400 CD Player with its clear protective cover attached, showcasing the CD mechanism.

Image: Side view of the Syitren R400 CD Player, highlighting the power on/off switch and the 3.5mm audio output jack.

Image: Detailed diagram showing the 3-position toggle switch, recessed charging dock with cable channel, and anti-slip raised feet on the Syitren R400 CD Player.
Setup
1. Initial Power On
- Before first use, remove the protective cardboard disc from the CD compartment.
- Locate the power on/off switch on the side of the device.
- Slide the switch to the "ON" position. The red indicator light will illuminate, indicating the device is powered on.
2. Charging the Device
- Use the provided USB-C charging cable.
- Connect the cable to the charging port located on the back of the device.
- It is recommended to use a 5V/2A power adapter (not included).
- The battery indicator lights on the back will flash sequentially from left to right during charging:
- 1 light: 30% battery
- 2 lights: 50% battery
- 3 lights: 100% battery
- When fully charged, all battery indicator lights will remain continuously on.
3. Installing the Protective Cover
The clear protective cover can be installed by aligning it with the main unit and gently pressing it into place until it clicks securely.

Image: The Syitren R400 CD Player with its clear protective cover detached, ready to be installed.
4. Installing the Stand
The included stand can be installed with or without the protective case. Align the stand's pins with the corresponding holes on the back of the CD player and push firmly until secured.

Image: Rear view of the Syitren R400 CD Player with the metal stand attached, allowing it to be displayed upright.

Image: Step-by-step diagram illustrating the installation of the DIY stand assembly, both with and without the protective case.
Operating Instructions
1. CD Playback
- Insert a compatible CD (CD, CD-R, CD-RW, MP3) into the player.
- After booting up, the player will automatically read the disc and begin playback.
- To pause/play music, short press the Play/Pause button.
- To stop playback and halt disc rotation, briefly press the Stop button.
- To return to the beginning of the current song, briefly press the Back button. Press it again immediately to switch to the previous song.
- To switch to the next track, briefly press the Fast Forward button.
- To fast-forward through a song, long press the Fast Forward button.
- To quickly rewind a song, long press the Back button.
Warning: Do not forcibly stop the rotation of the CD during playback as this may damage the device.
2. Volume Control
- Short press the "+" button to increase volume.
- Short press the "-" button to decrease volume.
3. Playback Order
The R400 offers three playback sequences, selectable via the toggle switch:
- Repeat All: Plays all tracks on the disc and then repeats the entire disc.
- Repeat One: Repeats the current track continuously.
- Shuffle: Plays tracks in a random order.
4. Wired Audio Connection
The R400 supports 3.5mm audio output. You can connect wired headphones or external speakers directly to the 3.5mm audio jack on the side of the device.

Image: Diagram illustrating how to connect wired headphones or speakers to the Syitren R400 CD Player via its 3.5mm audio jack.
5. Bluetooth Connection
The R400 functions as a Bluetooth transmitter, allowing it to connect to Bluetooth-enabled devices such as speakers or headphones. It does not have built-in speakers and cannot connect to mobile phones or computers.
- The default startup mode is 3.5mm output, and Bluetooth is initially turned off (red indicator light).
- Short press the Bluetooth switch (located near the 3.5mm jack) to switch to Bluetooth mode. The blue indicator light will flash, indicating the CD player is in Bluetooth search mode.
- On your Bluetooth audio device (speaker, headphones), enable Bluetooth and put it into pairing mode.
- Once successfully paired, the blue light on the CD player will remain constantly on. You can then play music.
- To reset Bluetooth and search for other devices, long press the Bluetooth switch.
Note: Due to Bluetooth protocol issues, some devices like Airpods, BOSE speakers, and car systems may not be compatible.

Image: Diagram illustrating how to connect the Syitren R400 CD Player wirelessly to Bluetooth audio devices like headphones or speakers.
Specifications
| Feature | Detail |
|---|---|
| Bluetooth Version | 5.3 |
| Supported Disc Formats | CD/CD-R/CD-RW |
| Supported Audio Formats | CD/MP3/WAV |
| DAC Chip Model | SC6137D |
| Signal-to-Noise Ratio (SNR) | 70dB |
| Output Power | 6.0MW@32Ω |
| Anti-Shock Buffer | 16s |
| Battery Model | 18650 |
| Battery Life (Full Charge) | ≥4H |
| Charging Time (0-100%) | ≥4H |
| Battery Capacity | 2000mAh |
| Rated Input | DC 5V/2A |
| Net Weight | 330g |
| Product Dimensions | 161x161x37mm (6.38 x 5.79 x 1.28 inches) |

Image: Visual representation of the Syitren R400 CD Player's technical specifications and a detailed list of included accessories.
Troubleshooting
This section addresses common issues you might encounter with your Syitren R400 CD Player.
- CD Player stops spinning in shuffle mode: After all songs have been played randomly, the CD player will stop spinning. This is normal behavior for shuffle mode.
- CD Player repeats the first song after the last song ends: In full loop mode, after the last song ends, the first song will start playing again. This is normal behavior for full loop mode.
- Bluetooth connection issues: Ensure your external Bluetooth device is in pairing mode. Long press the Bluetooth switch on the CD player to reset its Bluetooth connection and try pairing again. Remember, the R400 cannot connect to mobile phones or computers.
- No sound: Check if headphones or speakers are properly connected (wired or Bluetooth). Ensure the volume is not set to minimum.
Video: Syitren R400 CD Player Use Instructions. This video provides a comprehensive guide on operating the CD player, including power on/off, CD playback, playback order, power supply, output interface, Bluetooth function, accessory description, and common problems.
Maintenance
- Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
- Avoid exposing the device to extreme temperatures, humidity, or direct sunlight.
- Do not attempt to disassemble or repair the device yourself. Refer to qualified service personnel.
- Handle CDs carefully to prevent scratches, which can affect playback quality.
Warranty and Support
The Syitren R400 CD Player comes with a one-year warranty service to address any manufacturing defects or issues. For support, please refer to the contact information provided with your purchase or visit the official Syitren website.
For further assistance, please contact Syitren customer service.





