Introduction
The Tecsun M-303 is a compact and multi-functional device designed for portable audio entertainment and recording. It integrates an FM radio, Bluetooth receiver, music player, and voice recorder into a slim and easy-to-operate unit. Enjoy your favorite radio stations, stream music wirelessly, play files from a TF card, and record audio from various sources, all in one device.
Package Contents
Please check the box for the following items:
- Tecsun M-303 Unit
- Stereo Headphones (E-50 earphones)
- USB Micro Type B Charging Cable
- User Manual (this document)
Image: Tecsun M-303 black model shown with included E-50 earphones.
Product Overview
Familiarize yourself with the various parts and controls of your Tecsun M-303.
Image: Front view of the Tecsun M-303, highlighting the display, control buttons (loop mode, save/delete, play/pause, record/stop), speaker, and function indicators (FM, BT, REC, Music, Favorite Program, TF Card, USB Charging, ATS, FM Stereo, USB Data Transfer).
Image: Back view of the Tecsun M-303, indicating physical dimensions (62mm wide, 125mm high, 13mm thick) and port locations for USB charging/data transfer, microphone (Mic), and headphone jack.
Initial Setup
1. Charging the Battery
The Tecsun M-303 has a built-in polymer lithium battery. Before first use, fully charge the device.
- Connect the supplied USB Micro Type B charging cable to the USB port on the device.
- Connect the other end of the cable to a USB power adapter (DC 5V, current ≥ 500mA, purchased separately) or a computer USB port.
- The display will indicate charging status.
2. Powering On/Off
Press and hold the power button (usually located on the side or top) to turn the device on or off. The multifunctional display screen will activate upon power-on.
3. Inserting a TF Card (Optional)
To use the music player or extend recording storage, insert a TF (microSD) memory card (up to 128GB) into the designated slot. Ensure the card is inserted correctly with the contacts facing down.
Operating Instructions
FM Radio Operation
The M-303 supports an FM receiving range of 64-108MHz, configurable for different regions (e.g., 76-108MHz for Japan, 87-108MHz for China/Europe, 88-108MHz for Europe/Australia).
- Tuning: Use the tuning buttons (often labeled with arrows) to scan for stations.
- Automatic Tuning Storage (ATS): The device supports ATS for automatically scanning and saving available FM stations. Refer to the on-screen prompts or specific button combinations for this feature.
- Favorite Programs: Use the shortcut keys to quickly access your favorite saved radio programs.
Bluetooth Receiver
The M-303 features Bluetooth 5.0 for wireless audio streaming and hands-free calls.
- Pairing: Activate Bluetooth mode on the M-303. On your mobile phone or other Bluetooth device, search for "M-303" and pair.
- Hands-free Calls: Once paired with a mobile phone, the device can be used for hands-free communication.
- Computer Speaker: Connect the M-303 to your computer via Bluetooth or USB to use it as an external speaker.
Music Player
Play your digital music files directly from a TF card.
- Supported Formats: The M-303 can play 16-bit/44.1k FLAC, WAV, WMA, APE, and MP3 format music files.
- Playback: Navigate through your music files using the control buttons. The device supports breakpoint playback, resuming from where you left off.
Image: Tecsun M-303 displaying FM frequency, illustrating its capability to play various audio formats and function as a Bluetooth receiver and computer speaker.
Voice Recorder
The M-303 offers versatile recording capabilities.
- Recording Methods:
- Broadcast Recording: Record directly from the FM radio.
- Bluetooth Audio Recording: Record audio received via Bluetooth (Stereo MP3 format).
- Microphone Recording: Use the built-in microphone for daily recordings such as meetings, interviews, or language learning (Mono WAV format).
- Storage: Recordings are saved to the inserted TF memory card (supports up to 128GB).
Image: Tecsun M-303 highlighting its three recording methods: broadcast, Bluetooth audio, and built-in microphone, with support for up to 128GB TF memory cards.
Timing and Sleep Functions
- Timing Automatic Power-on: Set a specific time for the device to automatically power on.
- Humanized Sleep Shutdown: Configure the device to automatically shut down after 1-120 minutes of inactivity. This function can also be canceled if not desired.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use abrasive cleaners or solvents.
- Storage: Store the device 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 Exposure: This device is not waterproof. Avoid exposure to water or high humidity.
Troubleshooting
| Problem | Possible Solution |
|---|---|
| Device does not power on. | Ensure the battery is charged. Connect to a power source and try again. |
| Poor FM reception. | Extend the antenna fully. Move to an open area away from interference. Try ATS to rescan stations. |
| Bluetooth pairing fails. | Ensure the M-303 is in Bluetooth pairing mode. Check that your other device's Bluetooth is on and discoverable. Move devices closer. |
| Cannot play music from TF card. | Ensure the TF card is inserted correctly and contains supported audio formats (FLAC, WAV, WMA, APE, MP3). Check if the card is corrupted. |
| Recording issues. | Verify that a TF card is inserted and has sufficient free space. Check recording mode settings. |
Specifications
| Feature | Detail |
|---|---|
| FM Frequency Range | 64-108MHz (configurable for regions like 76-108MHz Japan, 87-108MHz China/Europe, 88-108MHz Europe/Australia) |
| FM Noise Limiting Sensitivity | < 3μV (S/N=30dB) |
| FM Selectivity | > 60dB |
| Storeable FM Frequencies | 100 |
| Supported Audio Formats | 16bit/44.1k FLAC, WAV, APE, WMA, MP3 |
| TF Card Support | Maximum 128GB |
| Recording Formats | FM & Mic: Mono WAV; Bluetooth: Stereo MP3 |
| Bluetooth Version | Up to 5.0 |
| Stereo Headphone Impedance | 32-150Ω |
| Speaker | φ45mm, 16Ω, 0.5W |
| Maximum Working Current | 260mA |
| Static Current (FM) | < 50mA |
| Standby Current | < 100μA |
| Power Supply | 3.7V (built-in polymer lithium battery); External DC power via Micro USB 5V (current ≥ 500mA) |
| Physical Size (H x W x T) | 125 × 62 × 13 mm |
| Net Weight | Approx. 93g |
User Tips
- Language Setting: If the display language is not English, check the device settings menu for language options. Many devices allow switching between languages like Chinese and English.
- Optimal Recording: For best microphone recording quality, ensure the device is placed on a stable surface and close to the sound source, minimizing background noise.
- Battery Life: To maximize battery life, consider using headphones instead of the built-in speaker when possible, as the speaker consumes more power.
Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact details provided with your purchase documentation or visit the official Tecsun website. Keep your proof of purchase for any warranty claims.