Yosoo Wireless Car Kit for Audio Receiver Amplifier - Retail Packaging - TDA7492P 2.1 Interface 8 ~ 25V DC power supply Audio input : CSR8635 Bluetooth chip Bluetooth V4.0 Output impedance: 8 ohm best(also can drive 4.6.8.16 Ohm impedance speakers) Output power: add pre-5532 output power sufficient , (power 25v 6 Ohm impedance output 2*50W , 8 Ohm impedance output 2*40W Double track)