1. Introduction
This manual provides essential information for the proper setup, operation, and maintenance of your MYMAHDI M400 80GB MP3 Player. Please read this manual thoroughly before using the device to ensure optimal performance and longevity.
The MYMAHDI M400 is a versatile portable media player featuring 80GB of internal storage, expandable up to 1TB via Micro SD card. It supports Bluetooth and Wi-Fi connectivity, allowing for streaming services and wireless audio. The device runs on an Android-based system, offering a range of pre-installed applications and multimedia capabilities.
2. Product Overview
Familiarize yourself with the components and features of your MYMAHDI M400 MP3 Player.

Figure 2.1: Front view of the MYMAHDI M400 MP3 Player, showcasing its touchscreen interface with pre-installed apps.

Figure 2.2: Overview of the MYMAHDI M400 MP3 Player's main features and specifications.
3. Setup
3.1 Unboxing and Initial Inspection
Upon receiving your MYMAHDI M400, carefully open the packaging and ensure all components are present and undamaged. The package typically includes:
- 1 x MYMAHDI M400 MP3 Player
- 1 x USB-C Charging Cable
- 1 x Earphones
- 1 x AUX Cable
- 1 x Transparent Protective Case
- 1 x English Manual
Figure 3.1: Included accessories with the MYMAHDI M400 MP3 Player.
3.2 Charging the Device
Before first use, fully charge the device. Connect the provided USB-C cable to the player's charging port and the other end to a compatible USB power adapter (not included) or a computer's USB port. The battery indicator on the screen will show charging status.
3.3 Power On/Off
- To Power On: Press and hold the Power button (usually on the side) until the MYMAHDI logo appears on the screen.
- To Power Off: Press and hold the Power button until a power-off menu appears. Select 'Power off' to shut down the device.
3.4 Initial Configuration
Upon first startup, you may be prompted to select your language and connect to a Wi-Fi network. Follow the on-screen instructions.
- Wi-Fi Connection: Navigate to 'Settings' > 'Wireless & networks' > 'Wi-Fi'. Select your desired network and enter the password.
- Bluetooth Pairing: Navigate to 'Settings' > 'Wireless & networks' > 'Bluetooth'. Turn on Bluetooth, then scan for available devices. Select your Bluetooth headphones or speaker from the list to pair.
4. Operating Instructions
4.1 Navigation
The MYMAHDI M400 features a 4-inch IPS touchscreen for intuitive navigation. Swipe left or right to browse through app pages. Tap icons to open applications. Use the navigation buttons at the bottom of the screen (Back, Home, Recent Apps) to move between screens and manage open applications.
Figure 4.1: Touchscreen interaction on the MYMAHDI M400.
4.2 Music Playback
The device supports various audio formats including WMA, OGG, APE, FLAC, WAV, AAC-LC, ACELP. You can play music from:
- Local Storage: Transfer music files directly to the device's internal 80GB storage or an inserted Micro SD card. Use the 'Music' app to browse and play your local library.
- Streaming Apps: Pre-installed apps like Spotify, Amazon Music, Apple Music, Pandora, Deezer, and Tidal allow you to stream music over Wi-Fi. Log in with your account credentials.
Figure 4.2: Music playback interface and supported formats.
4.3 Video Playback
The MYMAHDI M400 supports 720P/1080P full format HD video playback (RM, RMVB, AVI, MKV, WMV, VOB, MOV, FLV, ASF, DAT, MP4, 3GP, MPG, MPEG, etc.). Use the 'Videos' app to watch stored video content.
Figure 4.3: Video playback on the MYMAHDI M400.
4.4 FM Radio
To use the FM Radio function, plug in the earphones (which act as an antenna). Open the 'FM Radio' app and scan for available stations. You can save your favorite stations for quick access.
4.5 App Usage
The device comes with several pre-installed apps for various functions:
- Social Media: Facebook, Twitter.
- E-reading: Kindle, Audible.
- Utilities: Clock, Calendar, Calculator, Sound Recorder.
- File Management: Use the 'File' app to browse, copy, move, and delete files on internal storage and SD card.
Figure 4.4: Pre-installed applications on the MYMAHDI M400.
4.6 Official Product Video
Video 4.1: This video provides a detailed overview of the MYMAHDI Android Streaming MP3 Player, highlighting its features and functionality, including Spotify integration and 80GB storage.
5. Maintenance
5.1 Cleaning
Use a soft, dry, lint-free cloth to clean the device. Avoid using abrasive cleaners or solvents that may damage the screen or casing.
5.2 Storage Expansion
The device supports Micro SD cards up to 1TB. Insert the Micro SD card into the designated slot on the side of the device. Ensure the card is inserted correctly to avoid damage.
5.3 Battery Care
To prolong battery life:
- Avoid extreme temperatures.
- Do not fully discharge the battery regularly.
- If storing the device for an extended period, charge it to about 50% before storage.
6. Troubleshooting
If you encounter issues with your MYMAHDI M400, refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| Device does not power on | Ensure the battery is charged. Connect to a power source and try again. |
| Cannot connect to Wi-Fi/Bluetooth | Check Wi-Fi/Bluetooth settings. Ensure the network/device is discoverable and within range. Restart the player. |
| Apps crashing or freezing | Close background apps. Clear app cache in Settings > Apps. Restart the device. |
| Insufficient storage space | Delete unnecessary files or apps. Insert a Micro SD card for additional storage. |
| Poor sound quality | Check earphones/speaker connection. Ensure volume is adjusted correctly. Try different audio files. |
6.1 Factory Reset
If problems persist, a factory reset may resolve the issue. Warning: This will erase all data on the device. Back up important files before proceeding. Navigate to 'Settings' > 'Backup & reset' > 'Factory data reset'.
7. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 4.17 x 2.44 x 0.47 inches |
| Item Weight | 5.4 ounces |
| Item Model Number | M400 |
| Batteries | 1 Lithium Ion battery required (included) |
| Connectivity Technology | Bluetooth, USB, Wi-Fi |
| Memory Storage Capacity | 80 GB (Max Support 1 TB via Micro SD) |
| Screen Size | 4 Inches |
| Display Technology | LCD |
| Supported Audio Standards | WMA, MP3, OGG, APE, FLAC, WAV, AAC-LC, ACELP |
| Supported Video Standards | RM, RMVB, AVI, MKV, WMV, VOB, MOV, FLV, ASF, DAT, MP4, 3GP, MPG, MPEG |
| Operating System | Android-based |
8. Warranty and Support
For technical or operational problems, you can contact the Amazon service team to forward your inquiry to the MYMAHDI Service Team. The MYMAHDI Service Team is available 24 hours a day to assist with any technical and operational issues.
Please retain your proof of purchase for any warranty claims.



