Introduction
This manual provides detailed instructions for the operation and maintenance of your MECHEN D53 Portable MP3 Player. Please read this manual thoroughly before using the device to ensure proper functionality and to maximize your user experience.
Package Contents
Verify that all items are present in the package:
- 1 x MECHEN D53 MP3 Player
- 1 x Audio Cable (for Line-in Recording)
- 1 x Type-C Charging Cable
- 1 x Wired Headset
- 1 x User Manual
- 1 x 64GB TF Card (Micro SD Card)

Image: Contents of the MECHEN D53 MP3 Player retail package, showing the player, cables, headset, and documentation.
Product Overview
The MECHEN D53 is a portable MP3 player designed for high-fidelity audio playback and various multimedia functions. It features a 2.4-inch touch screen, Bluetooth 5.3 connectivity, and a built-in speaker.

Image: The MECHEN D53 MP3 Player, displaying its screen with music playback interface and physical control buttons.
Key Features:
- 128GB Storage Capacity: 64GB built-in memory with support for up to 128GB Micro SD card expansion (64GB card included).
- Bluetooth 5.3: For stable wireless connection to headphones and speakers.
- HiFi Lossless Sound Quality: Supports MP3, WMA, APE, FLAC, WAV, AAC formats.
- 2.4-inch Touch Screen: Intuitive navigation and control.
- Multi-functional: Includes FM radio, voice recorder, e-book reader, video playback, alarm clock, and stopwatch.
- Dual Audio Jack: Allows two users to listen simultaneously with wired headphones.
Setup
1. Charging the Device
Before first use, fully charge the MP3 player. Connect the provided Type-C charging cable to the player's Type-C port and the other end to a USB power adapter (not included) or a computer's USB port.
The battery icon on the screen will indicate charging status. A full charge typically takes approximately 2-3 hours.
2. Inserting the Micro SD Card
The device comes with a 64GB Micro SD card pre-installed or included separately. If not installed, locate the Micro SD card slot on the side of the player. Gently insert the card with the gold contacts facing down until it clicks into place.
Ensure the card is inserted correctly to avoid damage. To remove, push the card in slightly until it springs out.
3. Powering On/Off
To power on, press and hold the power button located on the side of the device until the screen illuminates. To power off, press and hold the power button again until the power-off prompt appears, then confirm.
Operating Instructions
1. Basic Navigation
The MECHEN D53 features a 2.4-inch touch screen for primary navigation. Swipe left/right or up/down to browse menus and options. Tap an icon to select it. The physical buttons below the screen provide additional control for playback and menu navigation.
2. Transferring Music Files
Connect the MP3 player to your computer using the provided Type-C USB cable. The player will appear as a removable disk. Drag and drop your music files (MP3, WMA, APE, FLAC, WAV, AAC) into the appropriate folders on the player's internal storage or the Micro SD card.

Image: The MP3 player connected to a computer via USB, demonstrating the process of transferring music files to its 128GB storage.
3. Music Playback
From the main menu, tap the "Music" icon. You can browse music by artist, album, genre, or folder. Select a song to begin playback.
- Play/Pause: Use the dedicated button or tap the screen.
- Next/Previous Track: Use the physical buttons or swipe on the screen.
- Volume Control: Adjust using the rotary knob on the side of the device.
- Song Search Function: From the music playback screen, swipe right to access the search interface. Enter keywords using the on-screen keyboard to find specific songs.

Image: The MP3 player's screen showing the music search interface, where users can input text to locate songs.
4. Bluetooth Connectivity
The D53 supports Bluetooth 5.3 for wireless audio. To connect:
- From the main menu, tap the "Bluetooth" icon.
- Ensure Bluetooth is enabled on the MP3 player and your Bluetooth headphones or speaker are in pairing mode.
- The player will scan for available devices. Select your device from the list to pair.
Note: Bluetooth function only supports connection to Bluetooth headphones and speakers, not smartphones or computers.

Image: A user listening to music via Bluetooth headphones, demonstrating the wireless capability of the MP3 player.
5. FM Radio
To use the FM radio, connect wired headphones to the 3.5mm audio jack. The wired headphones act as an antenna. From the main menu, tap the "FM Radio" icon. You can auto-scan for stations or manually tune.

Image: The MP3 player displaying its FM radio function, with wired headphones plugged in to serve as an antenna.
6. Voice Recorder
Tap the "Recordings" icon from the main menu to access the voice recorder. Tap the record button to start and stop recording. Recordings are saved in the device's memory.

Image: The MP3 player's screen displaying the active voice recording function.
7. E-book Reader
Transfer TXT format e-book files to the player. Tap the "Ebook" icon from the main menu to open the e-book reader. Select a file to read.

Image: The MP3 player's screen displaying text from an e-book.
8. Video Playback
The player supports AVI and AMV video formats. Videos must be converted to these formats before transfer. Tap the "Video" icon from the main menu to access video files.

Image: The MP3 player's screen displaying a video in landscape orientation.
9. Other Functions
The D53 also includes features such as a photo viewer, alarm clock, and stopwatch, accessible from the main menu.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Avoid liquid cleaners or abrasive materials.
- Storage: Store the player in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Charge the device regularly, even if not in use for extended periods.
- Water Resistance: This device is not waterproof. Avoid exposure to water or high humidity.
Troubleshooting
- Device does not power on:
Ensure the battery is charged. Connect the player to a power source and try again. If the issue persists, perform a hard reset by pressing and holding the power button for 10-15 seconds.
- Cannot connect to Bluetooth device:
Ensure both the MP3 player's Bluetooth and the target device are enabled and in pairing mode. Make sure the target device is a headphone or speaker. Try restarting both devices.
- Music files not recognized:
Verify that the music files are in a supported format (MP3, WMA, APE, FLAC, WAV, AAC). Ensure files are transferred to the correct folders on the device or SD card. Try refreshing the music library.
- Volume knob erratic or unresponsive:
This can sometimes be resolved with a firmware update. Contact customer support for assistance if the issue persists after a device restart.
- FM Radio not working:
Ensure wired headphones are properly connected to the 3.5mm audio jack, as they serve as the antenna.
Specifications
| Feature | Detail |
|---|---|
| Model | D53 |
| Dimensions | 3.33 x 0.46 x 1.98 inches |
| Weight | 3.14 ounces |
| Screen Size | 2.4 Inches |
| Internal Memory | 64 GB |
| Expandable Memory | Up to 128 GB (Micro SD Card) |
| Connectivity | Bluetooth 5.3, Type-C USB |
| Supported Audio Formats | MP3, WMA, APE, FLAC, WAV, AAC |
| Supported Video Formats | AVI, AMV (requires conversion) |
| Battery | 1 Lithium Ion battery (included) |
| Special Features | Equalizer, FM Radio, Touch Screen, Video Playback, Voice Recorder |
Warranty and Support
MECHEN provides 12 months of after-sales service for this product. For technical support, warranty claims, or further assistance, please contact MECHEN customer support through the retailer where the product was purchased or visit the official MECHEN website.
Please retain your proof of purchase for warranty purposes.





