[2-in-1 RX/TX, Receiver & Transmitter] This 2-in-1 Bluetooth car adapter works as both a Bluetooth transmitter and receiver and features a 3.5mm AUX jack. In transmitter mode, audio signals from a non-Bluetooth TV or laptop can be transmitted to Bluetooth speakers or headphones. In receiver mode, you can stream music from a Bluetooth-enabled phone or tablet to a non-Bluetooth stereo. [Widely Used Car Bluetooth Adapter] This car Bluetooth adapter connects to computers, TVs, and projectors (transmitter mode) via a 3.5mm AUX adapter, as well as stereos, speakers, car stereos, conventional stereos, and wired headphones (receiver mode). This auxiliary Bluetooth adapter can be plugged into a car stereo and connected to your phone's Bluetooth to listen to music. [Plug-and-Play, Type-C Fast Charging] This car Bluetooth transmitter is plug and play, no app installation required, and features a built-in microphone for clear hands-free calls. The built-in 150mAh high-capacity rechargeable lithium battery allows simultaneous charging, with a reception time of 8 hours and a transmission time of 5 hours. A 49cm Type-C fast charging cable is included for fast charging. [Bluetooth Version 5.1, High Performance and Stability] Backward compatible with Bluetooth versions V5.0, V4.2 and V4.1. Equipped with a powerful Bluetooth 5.1 chip, it ensures clear and stable transmission of the Bluetooth signal, for a smooth connection. A built-in independent antenna enhances the Bluetooth signal and provides wide coverage, allowing stable transmission up to 10 meters away.