Features: Long Time Use. Built-in large capacity battery, Li 180mAh/3.7V, to ensure long working time. Charge Port. Designed with USB charge port, supports playing while charging, for more enjoyment.= BT 5.0. BT 5.0 technology is upgraded to ensure its stable connection, which is not easy to disconnect even in the complex interference environment, and BT 5.0 chips delivers intelligent control of energy consumption, and effectively improves the usage rate of the battery. Turn the ordinary sound or car speaker into a BT speaker. Just plug the dongle to the ordinary sound with the 3.5mm audio cable, and pair it with the mobile phone, and you can enjoy the beautiful music now, which is very convenient, the same goes for car speakers. CD-level lossless audio sound. New decoding technology, delivers CD-level sound and transmit approximately lossless music via BT, to make the sound more real. Fast connection, more stable sound. 10m long transmission distance, and fast connection ensure its power performance and HD audio, low latency and low power consumption. Broad Compatibility. With the included 3.5mm cable, this Receiver Transmitter adapter can widely be used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc.