In transmitter mode, non-Bluetooth TVs, computers, players, iPods, MP3/MP4 players, and other devices can be transformed into Bluetooth transmitters. Receiver mode: Ideal for home or car music streaming systems. Connect this Bluetooth audio receiver to the input or AUX input of your speaker and pair it with your Bluetooth device to enjoy a whole new music experience. Whether you want to enjoy convenient Bluetooth music in your car, home theater system, bathroom, or bedroom, it can meet your needs. Simply connect the speaker and receiver with a simple 3.5mm male-to-male audio connector or 3.5mm male-to-male audio cable. Powerful Bluetooth chip for enhanced compatibility. Built-in rechargeable lithium-ion battery, powered via mini USB interface, offers long battery life and low power consumption. (Mini USB data cable included) You can play music through your car system and answer calls via the built-in microphone. Specifications: Material: ABS; Color: Black; Bluetooth version: V5.0+EDR; Bluetooth protocol: AD2P; Working distance: 10 meters; Function: Bluetooth audio receiver/Bluetooth audio transmitter; Package list: USB Bluetooth audio adapter *1