1. Introduction
This manual provides detailed instructions for the safe and efficient operation of your Oilsky M303 Pro 80GB Android MP3 Player. Please read this manual thoroughly before using the device and retain it for future reference.
2. What's in the Box
- Oilsky M303 Pro MP3 Player
- USB-C Charging Cable
- Wired Earphones
- Protective Film
- Protective Case
- User Manual
- 64GB TF Card (pre-installed or included separately)

Image: All items included in the Oilsky M303 Pro package.
3. Product Overview
3.1 Device Layout
The Oilsky M303 Pro features a compact design with essential controls and ports for ease of use.

Image: Front view of the Oilsky M303 Pro MP3 Player.
3.2 Buttons and Ports
- Power Button: Located on the side, used to power on/off and lock/unlock the screen.
- Volume Buttons: Located on the side, used to adjust audio volume.
- USB-C Port: Located at the bottom, for charging and data transfer.
- 3.5mm Headphone Jack: Located at the bottom, for wired audio output.
- Microphone: Built-in for audio recording.
- Speaker: Integrated for audio playback without headphones.
- TF Card Slot: For expandable storage (supports up to 1TB).
4. Setup
4.1 Initial Charging
Before first use, fully charge the device using the provided USB-C cable and a compatible power adapter. The charging indicator will show progress.
4.2 Power On/Off
- To Power On: Press and hold the Power button until the screen lights up.
- To Power Off: Press and hold the Power button, then select 'Power Off' from the options.
- To Lock/Unlock Screen: Briefly press the Power button.
4.3 Wi-Fi Connection
To access online features and download apps, connect to a Wi-Fi network:
- Go to Settings > Network & internet > Wi-Fi.
- Toggle Wi-Fi On.
- Select your desired network and enter the password if prompted.
4.4 Google Play Store Setup
The device runs on Android 9.0 and supports the Google Play Store for app downloads. Sign in with your Google account to access a wide range of applications.

Image: The device supports Google Play Store for application installation.
5. Operating Instructions
5.1 Basic Navigation
The device features a 4-inch IPS full touch screen. Navigate by swiping, tapping, and using the on-screen navigation buttons (Home, Back, Recent Apps).

Image: Full touch screen functionality for easy navigation.
5.2 Music Playback
The Oilsky M303 Pro supports various music formats and comes with a powerful music app, HiByMusic player. You can also download other music streaming apps from the Google Play Store.

Image: The HiByMusic player interface on the device.
5.3 Video Playback
Enjoy 1080P HD full-format video playback on the device's IPS screen. Transfer video files to the device or stream from supported apps.

Image: High-definition video playback on the device.
5.4 Bluetooth Connectivity
Connect your MP3 player to Bluetooth speakers or headphones for wireless audio. The device supports automatic connection to the last paired device.

Image: Bluetooth connectivity for external audio devices.
5.5 File Transfer
Connect the device to a computer using the USB-C cable to transfer music, videos, and other files. The device will appear as a removable storage drive.
5.6 FM Radio
To use the FM Radio function, plug in the wired earphones. The earphones act as an antenna for optimal reception. You can listen through the earphones or the device's built-in speaker.
5.7 Sound Recorder
Utilize the built-in microphone and the Sound Recorder app to capture audio recordings.
6. Storage
The Oilsky M303 Pro comes with 80GB of internal memory. It also supports expandable storage via a Micro SD card slot, allowing for significant additional capacity for your media files.

Image: Internal specifications including storage and processor details.
7. Battery Information
The device is equipped with a 2000mAh rechargeable battery. A full charge provides approximately 50 hours of music playback. Charging time is typically around 2-3 hours.

Image: Battery capacity and estimated usage times.
8. Maintenance
- Keep the device dry and away from extreme temperatures.
- Clean the screen and body with a soft, dry cloth. Avoid abrasive cleaners.
- Protect the screen with the provided protective film and case.
- Avoid dropping the device or subjecting it to strong impacts.
9. Troubleshooting
- Device not powering on: Ensure the battery is charged. Connect to a charger and try again.
- Bluetooth connection issues: Ensure Bluetooth is enabled on both devices. Try unpairing and re-pairing the devices.
- Overheating: Extended use, especially with demanding applications or during charging, may cause the device to warm up. If it becomes excessively hot, discontinue use and allow it to cool down. Avoid using the device in direct sunlight or hot environments.
- Slow performance: Close unnecessary background applications. Clear cache and temporary files. Consider performing a factory reset if issues persist (back up data first).
10. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 0.47 x 2.44 x 4.13 inches |
| Item Weight | 7.4 ounces |
| Item Model Number | M303 Pro |
| Operating System | Android 9.0 |
| Connectivity Technology | Bluetooth, Wi-Fi |
| Memory Storage Capacity | 80 GB (Internal) |
| Expandable Storage | Micro SD, Micro SDHC, Micro SDXC (up to 1TB) |
| Screen Size | 4 Inches |
| Display Technology | IPS LCD |
| Supported Standards | MP3 (and other formats via Android apps) |
| Battery Life | 50 Hours (Music Playback) |
| Charging Port | USB-C |
11. Warranty and Support
For warranty information and technical support, please refer to the contact details provided in the packaging or visit the official Oilsky website. Keep your purchase receipt as proof of purchase.