Features: brand new and high quality Transmitter Mode: Wirelessly stream audio from a non-Bluetooth TV, home stereo or CD player to a Bluetooth-enabled headset/speaker/receiver. Receiver Mode: Wirelessly stream audio from a Bluetooth-enabled phone, tablet, or computer to a wired stereo, speakers, or headphones. Wireless noise reduction technology, clearer sound, easier and faster connection, more stable signal, faster transmission.Transmit and receiver 2 in 1. Protocol support A2DP, SINK/A2DP, SOURCE,, connect two Bluetooth-compatible audio (headphones) at the same for time for Ideal for watching TV,movie-perfect synchronization. Used with APTX low latency supported devices. Specifications: Bluetooth-compatible version: V5.0 RF power +4DBM Bluetooth-compatible distance 10 meters MAX/33ft Frequency response 20-20KHz Performance description: Charging input voltage range: 5V Battery charging saturation voltage :4.2V Battery charging saturation for time is about 6~8 hours when fully charged, the red light is off and the blue light is for always on Low battery prompt voltage 3.3V red light flashes 3 times every 2 minutes to remind Low power shutdown voltage 3.0V red light on and shutdown Shutdown quiescent current: 100nA Working current :20~40mA Full battery life :30~38 hours Standby time: 180 days 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 PC x Audio Transmitter Receiver 1 PC x 3.5mm Aux Cable 1 PC x Manual