These Bluetooth on-ear stereo headphones allow you to listen to your iPod or other music source, allowing you to listen to music without the clutter of cords even if your iPod is 30' away. Using the Bluetooth 1.2 standard, the headphones communicate wirelessly with an included Bluetooth transmitter that plugs into your iPod. The transmitter may also be used with a stereo, CD player, computer, or any other audio device with a 3.5 mm headphone jack. Its lithium-ion battery provides up to 12 hours of talk time (up to 200 hours of standby time) from a two-hour charge with its included AC adapter. Transmitter: 2" Diam. x 1" D. (1 1/4 oz.)