DAOKI TDA7492P 50W+50W Wireless Bluetooth 4.0 Audio Receiver Digital Amplifier Board AUX Board Chip: TDA7492P Power: 2.1 interface 8-25V DC power supply Audio input: CSR8635 Bluetooth chip, Bluetooth V4.0(stereo input various versions of the bluetooth connection) Output Impedance: 8?(Best), 4/6/8/16? impedance can drive speakers Output Power: Add pre-5532 output foot (powered 25V,6? impedance output 2x50W, 8? impedance output 2x40W dual-channel)