Features 1.Adopt high quality TDA7492P power amplifier chip. 2.CSR8635 Bluetooth 4.0 module has good signal transmission capability and high software compatibility. 3.50W+50W dual channel stereo, excellent sound quality. 4.DIP switches can be adjusted directly after the amp gain and better promote greater damping horn. 5.Applicable for speaker of 4/6/8/16 ohms (8 ohms is the best). Specification Features: Adopt high quality TDA7492P power amplifier chip. CSR8635 Bluetooth 4.0 module has good signal transmission capability and high software compatibility. 50W+50W dual channel stereo, excellent sound quality. DIP switches can be adjusted directly after the amp gain and better promote greater damping horn. Applicable for speaker of 4/6/8/16 ohms (8 ohms is the best). Specification: Model: J3J7 Supply voltage: 8-25VDC (2.1 interface) Amplifier chip: TDA7492P Audio input: CSR8635 Bluetooth V4.0 Output Power: 2 x 50W (6Ω impedance), 2 x 40W (8Ω impedance) Output impedance: 4. 6, 8, 16Ω Package weight: Approx. 45g/1.6oz Package list: 1 x Bluetooth Audio Amplifier Board Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List