Parameter:
1. Power supply voltage: DC 3.7-5V
2. Power supply interface: MICRO USB port or 2.54mil pin port
3. Length, width and height: 3.3x3.5x1.1cm
4. Bluetooth name: BM3
5. Bluetooth password: 1688 (you need to enter the password to connect and cannot be modified)
6. Communication distance: 3-12 meters (different due to environmental obstacles)
7. Support Bluetooth version: Support Bluetooth 4.1 or below
8. Support mobile phone system: Android, IOS system
9. Channel: dual channel
10. Audio quality: MP3 lossless decoding
11. Built-in power amplifier: none
12. External power amplifier: does not limit the small external power amplifier
13. PCB thickness: 1.6mm
14. Needle spacing: 2.54mil

Features:
1. Have a Bluetooth connection password to prevent others from mistakenly connecting and operating.
2. Ultra-small size, easy to be embedded in modified products
3. Two-channel stereo output, compatible with most power amplifiers, home audio and video, car audio and other equipment in the market
4. Standard MICRO MINI USB 5P interface, the same Android phone charging port can be powered by the phone data cable
5. Specific DIY embedded refitting pins, which can be plugged in and soldered on your own circuit board for refitting
6. High-fidelity output circuit, resistance-capacitance isolation, no noise, good sound quality
7. Wireless plug-in U disk, memory card and button settings, pure mobile phone operation connection to play MP3
8. Equipped with 1 status pin, which can be used by professionals, such as combining single-chip microcomputer and relay switch to realize music desk lamp.

Application scenarios:
- Car audio modification, home audio modification
- Personal DIY Bluetooth audio, electronic project production
- Square dance sound, outskirt sound modification