Features:Dimensions : 52mm(L) x 21mm(W) x 11mm(D)Bluetooth v3+EDR， Class 2Support A2DP V1.2 (built in Mic)Powered by USB 5V DCTransmission Rate:3(Mbps)Built-in microphoneTransmission distances of up to 10MSupport A2DP stereo3.5mm stereo inlet socketSleep mode for energy savingSupport Bluetooth hands-free functionUp to 8 hours music playback or continuousWireless music receiver connects to 3.5mm headphone jacksUse with home stereos/speakers， car stereos，headphones etc.How to Use:1.Power on/offPower on: Press and hold the ON/OFF button for 5-7 seconds until you hear a "ready for connecting or a sound"， it will auto connect the phone which was paired.Power off: Press and hold the ON/OFF button for 4-5 seconds until you hear a "Long be or red led".2.Connect the receiver to your speakersWith 3.5mm Male to Male Audio Connector or 3.5mm Male to Male Audio Cable to connect the speakers and the receiver (if no sound， Please make sure it was inserted completely).Compatible With :iPhone 3G， 3GS， 4， 4s， 5， 5c and 5s， 6， 6 PlusiPad 1， 2， 3， 4， Air， Mini1 and 2Laptop and PC with bluetooth 2.1 and aboveSamsung， HTC， etc， all other Android 2.1 (and above) devices with BluetoothSmart-phone with Bluetooth 2.1 & abovePackage Included:1 x Bluetooth Music Receiver Built-in Mic1 x Micro USB Power Cable1 x 3.5mm Stereo Inlet Socket