No Required Any Battery When do you need a bluetooth transmitter? 1. Enjoy wonderful TV shows/movies/games at night without bothering your families. 2. Transmit your computer audio to bluetooth speaker, you can have stereo audio. 3. When you are doing housework or exercise, you can wear bluetooth headphones to enjoy music. STEPS TO CONNECT: 1.Connect the Transmitter to Power Source with USB socket of 5V,1 Amp like TV USB Socket or Mobile Power Adpater. The device is now powered 2. Connect 3.5mm Aux Cable with the transmitter to TV Audio Out /Earphone port. 3. Switch On the Bluetooth Earphone / Speaker. 4. Double click the Switch on the Transmitter for Pairing it. Fast Flashing of Blue light will appear. 5. Start pairing for Bluetooth devices. When in pairing the light on the Bluetooth earphone will flash fast. Now the devices will auto pair. Once paired the Blue light on Transmitter will become stable and stop flashing. This is successful pairing. NOTE: Keep both Bluetooth devices close to each other at the time of paring. Make sure all other Bluetooth devices are put off. NOTE 1. This bluetooth music transmitter(NOT receiver) CAN NOT pair with your cellphone/pad through bluetooth. It can only pair with bluetooth headphones/speakers. 2. If your bluetooth headphones/speakers need a bluetooth key to pair with, this transmitter cannot pair with them. 3. If you use it on your TV, please confirm there is audio output jack on TV.