Feature: 1. Sound quality is very good by using this module. 2. Using CSR8635 Bluetooth chip, Bluetooth V4.0, high software compatibility. 3. Power amplifier chip: TDA7492 double channels sufficient power 50W, better than TDA7492P. 4. With microphone (can call with Bluetooth), AUX interface(wired mode audio input). 5. With 5 buttons for adjustment, convenient and easy operation. 6. Applicable speaker impedance: 4/6/8/16 ohm (8 ohm is the best). 7. With 5 buttons for adjustment, convenient and easy operation.Applicable speaker impedance: 4/6/8/16 ohm (8 ohm is the best). 8. Using CSR8635 chip, Blue V4.0, high software compatibility. 9. With microphone,AUX interface(wired mode audio input). Specification: It's designed to optimize the circuit layout. Sound quality is very good and it can drive 4/6/8/16 ohm speakers. BT V4.0, it has sufficient power output 2*50W. Features: Sound quality is very good by using this module. Using CSR8635 BT chip, BT V4.0, high software compatibility. Power amplifier chip: TDA7492 double channels sufficient power 50W, better than TDA7492P. With microphone (can call with BT), AUX interface(wired mode audio input). With 5 buttons for adjustment, convenient and easy operation. Applicable speaker impedance: 4/6/8/16 ohm (8 ohm is the best). Specifications: Supply Voltage: DC 10-25V Power Interface: 2.1 DC Socket Audio Input: BT Receiver V4.0 Amplifier Chip: TDA7492 Output Power: 2*50W Applicable Speaker Impedance: 4/6/8/16 ohm Number of Channels: Two-channel Stereo PCB Board Size: 81 * 58mm / 3.2 * 2.3in Weight: 47g Package List: 1 * BT 4.0 Audio Receiver Power Amplifier Board Package List: 1 * BT 4.0 Audio Receiver Power Amplifier Board