Functional: The bluetooth-compatible adapter supports both transmitter and receiver functions, convenient for users to upgrade media devices. Rechargeable: Built-in with a built-in battery, the audio adapter ensures a long work time after being fully charged. Long-range: The wireless audio transmitter features long transmission ranges, which ensures stable signals at home and in the office and car. Compact: The bluetooth-compatible adapter is small and lightweight, easy to carry and store, not taking much space. Wide applications: The audio converter is perfect for car players, computers, televisions, music speakers, and other audio devices with 3.5mm jack. Specification: Material: Plastic. Size: Approx. 66x20x12mm/2.59x0.78x0.47 inch. Color: Black. Bluetooth-Compatible Version: V5.1. Operating Frequency Range: 2.402GHz~2.480GHz. Interface: Input: 3.5mm; Output: 3.5mm. Battery Capacity: 150mAh (Built-in, Rechargeable). Battery Life: RX: About 8H; TX: About 5H. Charging Time: About 2 Hours. Charging Mode: Type-C, 5V. Transmission Range: Approx. 10~15m/32.8ft~49.21ft. Note: There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Bluetooth-Compatible Adapter