Features: brand new and high quality This power amplifier board has a WiFi clock. 6 alarm clocks can be set, 8 levels of brightness adjustment; equipped with global for time zone, automatic network for time synchronization, can be disconnected from the network operation, accurate for time. It adopts domestic Class D power amplifier chip scheme. High efficiency, good distortion and squeak resistance; transparent sound quality, strong power. Classic appearance multi-function main knob. The main knob adopts the rotary encoder used by the high-end power amplifier to achieve 360-degree stepless tuning; the hand feels smooth. High-speed and stable connection for Bt. Built-in Super 5.0 series Bt compatible chip, effectively reducingThe mobile APP controls the playback delay. APP visual operation for play mode supports Android (please download from market, search "Sinilink" to download). Support audio input: Bt compatible 5.0, AUX, U disk, USB sound card input. Support audio output: active speakers, passive speakers. Specifications: Power supply: DC8-24V/2A or above Bt compatible version: 5.0 Audio input: Bt compatible + AUX + U disk + USB sound card Volume adjustment: encoder 360 degree stepless tuning Audio output: passive speaker + 3.5mm audio interface Output filter: no filter Cooling method: heat sink Applicable speakers: XY-W50L: 4-8 ohms, 10-100w; XY-W100L: 4-8 ohms, 20-200W Special function: Support Sini link-APP control Clock function: WiFi timing + high-precision clock chip for Protection mechanism: for protection against static electricity, overcurrent, short circuit, overheating, etc. Material: Plastic Color: As the Picture Shows Product Dimension: approx. 7.2x6x3.1cm/2.83x2.36x1.22inches Net Weight: 110g/0.24lbs Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1Set 2x100w Stero Hifi Power Amplifier Board