Features : This product is a mini portable Bluetooth speaker. The size of 62 * 62 * 73.7mm is light and easy to carry.Transmission Distance : True wireless stereo series connection, two speakers can be played in series. The high-quality chip makes the audio transmission stable and fast, and the linear connection distance can reach 10m / 32.8ft. As long as it is connected with Bluetooth, the audio transmission will not be delayed, it is compatible.Interface Type : It supports connecting the speaker through the USB port and the memory card port through the button for operation. It also supports reading memory card / USB / FM / AUX (memory card is not included).Sound Quality : The bottom bass diaphragm design releases HIFI-level sound and brings you extraordinary enjoyment.