Connecting one device to another has never been easier. This multi-directional device can be setup to transmit, or receive. In transmit mode, it can stream an audio source to a Bluetooth capable receiver or standalone Bluetooth speaker. In receive mode it can receive streaming from a Bluetooth capable computer, iPhone, and more, to play on your stereo system, computer, and more. It retains full digital quality and has an internal rechargeable battery. It charges in around 2hrs, for approximately 12hrs send/receive time. It's tiny and weighs just 18g, so you can take it anywhere! Send / Receive Mode Selection Rechargeable Portable Extremely Lightweight Operating Frequency: 2.4GHz Run Time: 12hrs Approx. Bluetooth Standard: v4.1, Class II Power: Internal 250mAh Lithium Battery Recharge Method: USB Cable (Supplied) Width 44mm Height 12mm Depth 44mm Weight 18g Bluetooth Version V4.0 Rechargeable Battery Recharging Time 2hr