2in1 Wireless Bluetooth Transmitter Receiver Adapter Home Stereo TV A2DP Audio Wireless Bluetooth Receiver/Transmitter 2 in 1 Built-in 600 mah Li-polymer battery average of 8 to 10 play with full charge. Full charge of battery takes average of 2 hours. Use the Transmit Mode to transmit audio from your TV to your bluetooth headphone or speaker. Make your hardwire Speaker, Headphone or car stereo system have wireless bluetooth capabilities. Real time low latency and high quality audio transmission. Your audio transmission master: Used for all your audio interface devices like your TV, PC, CD Player and etc. User manual provides very detail instructions to transmit or receiver audio from bluetooth automatic pairing to searching bluetooth profile name. Bluetooth v4.2 2 Audio Input ports. Transmitter and Receiver Ports. Packaging Includes: Bluetooth Transmitter and Receiver 3.5mm/AUX cable Micro-USB to USB cable User Manual