BT-22 Bluetooth 5.1 Audio Receiver Transmitter with Microphone 3.5mm AUX RCA Jack Wireless Stereo Adapter Car Headphone USB Dongle Multifunction: This Bluetooth-compatible audio adapter supports transmission, reception and calls, making your life more convenient Rechargeable: The Bluetooth compatible transmitter adopts Type-C rechargeable design, with large battery capacity, ensuring long-term work Extensive compatibility: Bluetooth-compatible receivers are compatible with home stereo systems, car players, TVs, etc. Bluetooth compatible: The wireless audio adapter is equipped with Bluetooth compatible V5.1 technology, with faster transmission speed and more stable connection with mobile phones Low latency: The audio adapter is built with advanced chips to ensure high sound quality, providing a better music experience at home, in the car, office, travel, etc. Specifications: Product name: Bluetooth audio receiver 3 in 1 Bluetooth version 5.1 Bluetooth name: BT-22 Connection range: 15M Battery capacity: 200mAh Working hours: receiving 8h, transmitting 5h Frequency response range: 10Hz-20hkz SNR: less than 110dB Product functions: receive+transmit + call 3 in 1 Product size: 80*20mm Package included: 1 x BT-22 Adapter 1 x 3.5mm Audio Cable 1 x 3.5mm to 2RCA Audio Cable 1 x USB Power Cable 1 x English and Chinese User Manual Other items not include