Packaging accessories: 1. Bluetooth music receiver host 1 set 2. 1 piece USB charging cable 3. 1 x 3.5mm audio adapter cable 4. 1 x 3.5mm metal adapter Features: Bluetooth transmission distance 5m Support Bluetooth hands-free calling function p> Support A2DP Bluetooth stereo Support call functions such as answer, hang up, reject and call back Support call technology Echo cancellation and noise suppression (CVC) during calls Lithium battery specifications: 200 mA/h 602025 Charging time: approx. 2.5 hours Working hours: about 8-10 hours Dual device connection: After successfully connecting to the first device, turn off Bluetooth, then connect to the second device. Once the second one is successful, turn on the first Bluetooth device Enjoy Wireless Music Streaming: This Bluetooth receiver adds Bluetooth functionality to a variety of non-Bluetooth devices via a 3.5mm AUX cable, such than non-Bluetooth car audio systems, stereos, speakers, wired headphones. Bluetooth 5.3 and Dual Paring: Upgraded Bluetooth 5.3 chip is built-in for stable connection and transmission fast. The bluetooth jack is compatible with most Bluetooth devices, such as smartphones, iPads, laptops, etc. Support 2 Bluetooth devices to connect simultaneously, just pause the currently playing device and play the other to switch music sources.