Adopts original TDA7498E dual-BTL power amplifier chip, high power, good sound quality, no distortion, give you a great hearing enjoyment. Output power: 160Wand160W (Vcc = 36 V, RL = 4Ohm, : 10percent ) Output power: 1x220W single channel in parallel BTL(Vcc = 36 V, RL = 3Ohm, : 10percent ) High efficiency: 85percent . Applicable speaker impedance: 4 ohm, 6 ohm, 8 ohm Four fixed gain settings available: 29.6 dB, 33.1 dB, 35.6 dB and 35.6dB. With standby, mute features: short the points shown on pictures to be standby or mute, also can be vacant temperature controlled forced air cooling. color: red Support BTL mode (short J1, J2, J3, J4 located on the back of amplifier board) Material:CCL Package Includes: 1 x TDA7498E Amplifier Board Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.