Feature:1. 2.1 Channel: The Bluetooth power amplifier board adopts 2.1 channel, stereo output, output power 50W, 50W and 100W, HIFI fever sound quality, pure and transparent treble, and surging and shocking bass.2. Knob Adjustment: The classic looking multi function main knob is adjusted by a dedicated high end coding knob to achieve 360 degree continuous tuning, glossy hand feel, support one key start and stop, and simple and convenient operation.3. Multifunctional: Digital power amplifier module supports mobile phone APP control, upgrade for YS APP sound control, visual playback mode supports for iOS, for Android system and Bluetooth, supports changing name, setting connection password, volume, playback pause, etc.4. Compatible: The sound power amplifier module has multiple input and output modes and is compatible with almost all home devices, such as smartphones, MP3s, PCs, TVs, tablets, laptops, etc.5. Multiple Protections: The power amplifier board has built in protection mechanisms with electrostatic protection, overheating, overcurrent and short circuit protection.Specification:Item Type: Sound Power Amplifier ModuleMaterial: PCBPower: 50W, 50W, 100WChannel: 2.1 ChannelBluetooth Version: 5.1Sound Input: Bluetooth, Aux, USBSound Output: Left and Right Channels, Bass, 3.5mm StereoProtection Mechanism: Electrostatic Protection, Overcurrent Protection, Short Circuit Protection, Overtemperature Protection, Etc.Unique Function: Support for YS Sound APP Control.Package List:1 x Sound Power Amplifier Module2 x Covers6 x Knob Covers1 x Heat Sink1 x Sponge Piece1 x Screwdriver8 x Gold Screw Posts9 x Black Screws