Description: This is the new amplifier from Nobsound. Based on our previous product, we have improved its output and enhanced its functionality, while maintaining its miniature size and elegant design. Although the size is small (one hand can hold it), the power is increased to 40W (20W*2) through the upgraded TPA3116 chip. When you see it, you will be amazed by its power compared to its size. Support AUX/USB/Bluetooth input. You can enjoy your music in different ways. The Bluetooth functionality has also been upgraded. Now it is more stable and faster. It should be mentioned that via USB input, it is possible to play music losslessly (just like connecting to a computer, by the way you don't need to install drivers). You will be amazed by the sound quality. Specifications: Product Name: 20W+ POWER Stereo Bluetooth Digital Power Amplifier Supply Voltage: 8~24V (the higher the voltage, the greater the power) Bluetooth version: 5.0 Cool feature: Support Sinilink APP control Input method: Bluetooth + AUX + U-disk + USB sound card Volume adjustment: Encoder Volume adjustment, Soft Touch, One-button switch Transmission distance: 15 meters (unobstructed) Number of channels: Left and right dual channel (stereo) Adapter speaker: 10W~200W 4Ω 8Ω 16Ω Power: Reverse connection protection, short circuit protection, overheating self-recovery protection Note: The power supply should be greater than the power consumption, otherwise the sound quality will be affected. If the power is greater than 20W+20W, the heat sink should be added. Package includes: 1x 20W+ POWER Stereo Bluetooth Digital Power Amplifier