Description: This is the new amplifier from Nobsound. Building on our previous product, we have improved its performance and 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 surprised by its performance compared to its size. Supports 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 through the 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 surprised by the sound quality. Specifications: Product name: 20W+20W Stereo Bluetooth digital power amplifier Supply voltage: 8~24V (the higher the voltage, the greater the power) Bluetooth version: 5.0 Cool feature: supports Sinilink APP control Input method: Bluetooth + AUX + U disk + USB sound card Volume adjustment: encoder volume adjustment, smooth feel, 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 protection: reverse connection protection, short circuit protection, self-recovery overheating protection Note: Supply voltage should be greater than the speaker's power, otherwise the sound quality will be affected. If the speaker's power is greater than 20W+20W, the heat sink should be added Package included: 1x 20W+20W Stereo Bluetooth digital power amplifier