Before you buy:-What is the difference between Bluetooth Receiver and Transmitter?Bluetooth Transmitter(like TT-BA02 / TT-BA01) can be plugged into your AUDIO GENERATING devices, such as  MP3 player, CD player, TV, Kindle Fire, iPod and computers. Since these devices do not have Bluetooth function, audio signal transmitted through the 3.5 mm connection will be broadcast by the Bluetooth Transmitter.Bluetooth Receiver(like TT-BR01) connects to your headphones or stereo speakers and makes them Bluetooth enabled. Receivers "listen" to Bluetooth audio broadcast signals and convert it into 3.5 mm audio signal for your headphone and speakers.-Cannot be used with a mono/single-side headset. It is used to be paired with stereo Bluetooth headphone such as Taotronics TT-BH03 (search for "B00CANBF0O" on Amazon).-Cannot be used to make and take phone calls;- When using TaoTronics TT-BA02, you will have to control play/pause/forwards/backwards on your audio devices, instead of the paired BT headset.Specification:- Bluetooth Version 2.1- Range: 10 meters- Work Time: 5-8 Hours- Dimension: 45 x 33 x 8mmHow to use:1. Plug the Bluetooth Transmitter into any devices with 3.5mm audio port.2. Pairing: Press and hold the button for 6 seconds until the red and blue LEDs flash alternatives. The Bluetooth Transmitter will now be in paring mode.Please place TT-BA02 within 1 meter range of your Bluetooth device during the pairing process.3. Connection: Pair to the Bluetooth stereo headset automatically.FAQ1.Q:Can TT-BR01 be used while charging?A:Yes.