1Amplifier Board: Equipped with stereo port, this audio amplifier board ensures lossless and high definition sound quality. 2Adjustable Design: Supporting BTL mode, the AMP module has 4 fixed gains for setting, 29.6 dB, 33.1 dB, 35.6 dB, 35.6dB. 3Secure Protection: Has short circuit protection, overheating protection as well as anti reverse protection for safe working. 4Stable Working: Adopting air cooling and large heat dissipation area for temperature control, can run stably for long time. 5Practical Using: The output power is 160W+160W, which enables flexible application in home theatre, large speaker, etc. Item Type: Digital Amplifier Board Material: Printed Circuit Board Function: Power Amplifier Board Input Voltage: DC 12V-32V Chip Model: TDA7498E Output Power: 160W+160W BTL Output Power: 220W Efficiency: 85% Applicable Speaker Impedance: 4 ohms, 6 ohms, 8 ohms 4 Available Fixed Gain Settings: 29.6 dB, 33.1 dB, 35.6 dB, 35.6 dB.Features: Support BTL mode (short circuit J1, J2, J3, J4 on the back of the power amplifier board). 1 x Digital Amplifier BoardDo not use it outside the voltage range.