MP3 Bluetooth decoder board Lossless car speaker audio amplifier board modification diy audio receiver 4.1 module Power supply voltage: DC 3.7-5V Power supply interface: MICRO USB port or 2.54mil pin port Length, width and height: 3.3x3.5x1.1cm Bluetooth name: BM3 Bluetooth password of this batch: 1688 (you need to enter the password to connect, can not be modified) Communication distance: 3-12 meters (varies due to environmental barriers) Support Bluetooth version: Support Bluetooth 4.1 or below Support mobile phone system: Android, Apple system Channel: dual channel Audio quality: MP3 lossless decoding Built-in power amplifier: none External power amplifier: does not limit the small external power amplifier PCB thickness: 1.6mm Needle spacing: 2.54mil The package includes: 1*Bluetooth decoder board