Description: 【2 in 1】: Bt receiver and transmitter 2 in 1 function, TX Rx modes can be switched freely, easy to use 【Stable Connection】: Bt 5.4 audio adapter, low latency, fast transmission and stable connection within 10m. 180mah Type C rechargeable battery capacity, fully charged in 2 hours, can play music for 10 hours 【Wide Applications】: The 3.5mm Aux adapter is suitable for car audio systems, home stereos, speakers, headphones, TVs, computers, etc 【Handsfree Call】: The wireless audio adapter is built in noise cancelling microphone and creates lossless audio quality music, supports AAC/SBC audio decoding and supports handsfree call, you do not have to look down at your phone on the driving 【Easy to Use】: Mini and portable audio adapter with a flexible and bendable 3.5mm jack, lightweight and easy to carry, suitable for various audio devices Specification: Material: ABS plastic Bt version: V5.4 Frequency: 2.4GHz-2.48GHz Transmitting distance: ≤10 meters Receiving distance: ≤10 meters Receiving function: connect to 1 mobile phone Transmitting function: connect to 1 pair of Bt headset/Bt speaker Battery capacity: 180mah Charging time: about 2 hours Playing time: about 10 hours (receiving mode), about 8 hours (transmitting mode) Size Chart: 9.4cmx2cmx1.2cm/3.70inchx0.79inchx0.47inch Package Includes: 1 Audio Adapter 1 Charging Cable 1 Manual Note: Please allow slightly errors due to manual measurement and different monitors.