Infineon's 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. There are other WiFi 2.4G and Bluetooth devices in the use environment, which is prone to interference, which may lead to unsuccessful connection, or sound freeze, or even interruption of playback. Bluetooth also affects effective transmission due to too long a distance or being blocked by a block (such as a wall). It is recommended that the straight-line distance for obstacles is generally about 8-10 meters. For some Android mobile devices, Bluetooth may not be fully compatible, which may result in abnormal playback. Please confirm that there is no compatibility issue with the mobile phone before use.