Features:Easy to Operate: Simply connect your speaker/headset with our device, immediately transform your speaker/headset into a fashionable wireless Bluetooth speaker/headset.Wireless Play: Removing troubles of wired connection, through the wireless connection and transmission, the user can enjoy a high fidelity music at any place indoor by wireless control.Portable Design: Mini size with clip design the feature of portable can let you carry them to anywhere you want.Support for iPhone, Android phone, other smart phones which with Bluetooth A2DP function.Compatible with home stereos / speaker, car stereos, headphones that is with 3.5mm audio input. Specification: Type: Bluetooth Audio ReceiverMaterial: PlasticQuantity: 1 pcItem Color: BlackBluetooth Version: 4.1Frequency Range :2.4GHzProfile: A2DPTransmission Range: Up to 10m / 33ftI/O 3.5mm female plug, Mini USB female portPower Supply: DC 5VCharge Time: About 30 minWorking Time: About 4hSize: 1.4*1.5*5.8cm / 0.5*0.6*2.3" (L*W*H) Package: 1*Bluetooth audio receiver1*3.5mm to 3.5mm adapter1*English user manual