Yosoo Wireless Digital Bluetooth 4.0 Audio Receiver Digital TDA7492P 50W+50W Amplifier Board Power :2.1 inferince 8-25V DC power supply Audio input : CSR8635 Bluetooth chip Bluetooth V4.0 Output Impedance :8 ohms Best (4,6,8,16 ohms impedance can diver speaker) Output power: add pre-5532 output power sufficient , (power 25v 6 Ohm impedance output 2*50W , 8 Ohm impedance output 2*40W Double track) Package: 1pc assembled board