Amplifier -Wireless Bluetooth,Digital Board Highlights Generic Brand Wireless Bluetooth,Digital Board Description: Power supply: 2.1 power supply 8-25V DC interface Audio input: stereo input with different versions of the Bluetooth connection, using the Bluetooth chip CSR8635, Bluetooth V4.0, high software compatibility Output impedance: 8 at most (4, 6, 8, 16 impedance can drive the speakers) Output power: Add pre-5532 output foot TDA7492 chip d 'digital amplifier, designed to optimize the circuit layout, the sound quality is very good. Module size: approx. 80 x 50 x 20mm / 3.15 x 1.97 x 0.79inch Color: Red Material: Plastic Package includes: 1 x CSR4.0 Bluetooth Digital Wireless Audio Receiver Amplifier Board