The TPA3116 digital amplifier is a stereo digital amplifier with a maximum output of 50W per channel and 100W for stereo. It features three stereo inputs, EQ sound effects, treble and settings, and infrared remote control. It utilizes the TPA3116 digital amplifier chip and the PT2314 sound processing chip. Functional:1. Mute: the encoder twice in succession. In mute mode, rotate the encoder left or right to unmute, or 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- 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. : Short- the encoder to illuminate the "L" LED, indicating the 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- the encoder for 2 seconds to switch between CH1 and CH4. Input Interface: 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 , the Philippines,Taiwan and so on. Color: Black Material: Aluminum Alloy Package Contents: 1 x Amplifier 1 cord 1 x Remote control (without 1xbutton battery,You need to prepare yourself) Only the above package content, other products are not included. Note: Light reflection 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.