1. Excellent quality: high quality material, safe and . 2. Stable performance: with better noise performance, excellent output drive capability and relatively high small signal bandwidth, large power supply voltage range. 3. High fidelity: When used as an audio amplifier, the tone is warm and the fidelity is high. 4. Wide range of uses: suitable for high quality and professional audio equipment, instruments, control circuits and telephone channel amplifiers. 5. It has the characteristics of small size, high efficiency, high power and small heat. 10 kinds of up to 1023 kinds of sound combinations Increase the heat sink cooling effect is good Over-temperature and short-circuit protection against static electricity With interconnect function Supports Bluetooth 5.1 connectivity Transmission distance: 10 meters (if you need a longer distance, please connect the external antenna yourself) Audio input: Bluetooth+AUX Audio output: left channel 50W + right channel 50W + subwoofer 100W Adapter power supply: DC12-24V, 27A (can not be connected to AC) Adapter speakers: left and right channels 20-50W, 4-8ohm; subwoofer 20-100W, 4-8ohm Protection mechanism: over temperature, over current, short circuit, anti-static protection Feature: Support APP. Batch differences may lead to product appearance, printed text, color be different, does not affect the use Note: If you need interconnection, you need to buy two amplifier boards Colour:black Material:PCB+metal Size:12.1 x 10 x 2.6cm Package Contents: 1 x amplifier board (need to install themselves) 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.