The TPA3116 digital amplifier is a stereo digital amplifier with a maximum output of 50W per channel and 100W for stereo. It features three CRA stereo inputs, EQ sound effects, treble and bass settings, and infrared remote control. It utilizes the TPA3116 digital amplifier chip and the PT2314 sound processing chip. Functional:1. Mute: Press the encoder twice in succession. In mute mode, rotate the encoder left or right to unmute, or press the encoder twice in succession. 2. Volume: Rotate the encoder left or right to decrease the volume on the left and increase it on the right. 3. Treble: Short-press the encoder to illuminate the "H" LED, indicating the treble setting. Rotate the encoder left or right to change the parameter. This also allows for custom sound effects. If the encoder is not pressed for 5 seconds, it automatically switches to volume. 4. Bass: Short-press the encoder to illuminate the "L" LED, indicating the bass setting. Rotate the encoder left or right to change the parameter. This also allows for custom sound effects. If the encoder is not pressed for 5 seconds, it automatically switches to the volume up/down function. 5. Channel Switching: Long-press the encoder for 2 seconds to switch between CH1 and CH4. Input Interface: RCA input Rated frequency: 50/60Hz Rated power: 100W Resolution: 100% Distortion rate: 0.1% Channels: 2.1 Impedance: 4-8 Ω Voltage: AC100-240V Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. Color: Black Material: Aluminum Alloy Package Contents: 1 x Amplifier 1 x Power cord 1 x Remote control (without 1xbutton battery,You need to prepare yourself)