1. Multiple devices are plug-and-play, and are compatible with AUX audio ports 2. Newly upgraded Bluetooth 5.3, DSP technology and A2DP dual-core processor, fast response speed, low power consumption and stable transmission 3. Receiving mode, receive Bluetooth signals, and output to speakers/headphones and other devices through AUX audio 4. One-touch hands-free calling, when Bluetooth is connected, you can talk freely and say goodbye to the danger of answering the phone while driving, making driving safer 5. Transformed into a Bluetooth speaker, after the mobile phone Bluetooth is paired, connect the AUX audio jack to the speaker without Bluetooth function to transform into a Bluetooth speaker Battery capacity: 240 mAh Working time: about 13 hours in RX mode/about 17 hours in TX mode Charging time: about 2 hours Single set weight: 50g Single set contains: host*1 Type-C charging cable*1 instruction manual*1