Features: brand new and high quality Our bluetooth-compatible transceivers can wirelessly transmit stable audio signals via Bluetooth-compatible connection and deliver the sound in CD quality. The bluetooth-compatible transceiver uses the low-delay technology in both modes, which can reduce the audio delay , allow you to enjoy high-quality audio in sync with the video The built-in battery provides Bluetooth-compatible adapter for more than 8 hours after charging for 3 hours. Bluetooth-compatible adapter supports not only the 3.5mm Aux / RCA connection but also optical cable inputs / outputs. With the optical cable, you can enjoy high-quality digital sound through multiple audio outputs, eg. Wired stereo, speakers or headphones. The product has a beautiful appearance, with built-in rechargeable battery, long service life. Specifications: Bluetooth-compatible protocol: 5.1 RX TX Transmission distance: over 15M/49.2ft (open space) Battery standard: 200mAh. Working hours: approx 5H(Transmitting) 5H(Receivering) Input/output connection: 3.5mm stereo interface. Charging Power: Type C Interface Size:approx 8x8x2cm/3.15x3.15x0.79in Color: Black Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 x Bluetooth-compatible Transmitter & Receiver Adapter 1 x Type C Charging Cable 1 x 3.5mm Audio Cable 1 x User Manual