["Infineons new technology class D power amplifier MA12070 chip in this small machine large number of audio grade components are used to enhance the sound experience." Built-in Bluetooth 5.0 receiver supports. Great sound quality longer transmission distance. Signal stability and transmission quality have been improved in all directions. Beautiful and simple. Built-in 2 sets of subwoofer signal pre-output for easy connection with active subwoofer system 2.1 or 2.2. Built-in low-noise big-power audio dedicated switching power supply to ensure continuous powering. A good power supply will directly affect the sound quality of playback. Perfect protection circuit for overheating overcurrent etc. High quality power adapter specially designed for audio. Three input methods - USB/ Bluetooth 5.0/ Line in USB audio input and support for driver-free use. High quality gold-plated input and output terminals. 12-month warranty you can return the item or replace a new one if you have any problems.]