TDA7498e, 100% OK Tested Product. Enjoy Good Sound, Please use external speaker for connection, Two Speaker Output come from circuit. Sound input function: you can give sound input from other sound sources like Mobile, TV, DVD, Computer, Projector. Operate with 15-33 Volt DC (Not Include) use 2 external speaker for output, (Not Include) output power: 100w+100w (vcc = 36 v, rl = 6I, thd: 10 percent) output power: 80w+80w (vcc = 34 v, rl = 8I, thd: 10 percent) speaker impedance: 4-8 ohm (8 ohm best, 4 ohm or 6 ohm also works) four fixed gain settings available: 25.6 db, 31.6 db, 35.1 db and 37.6 db adopts differential input to minimize common-mode noise protection: Short-circuit protection, over temperature protection with standby and mute features high efficiency: 90 percent note : Packaging with exposed pad up (epu), more convenient to mount a separate heatsink mode : Three kinds of modes avaliable: Standby/ mute/ normal working mode standby mode-all circuits closed, at a low power state, mute mode-all input signals connects ground, the duty cycle of forward/backward pwm output signal is 50 percent, normal working mode-the amplifier module works normally.