Specifications:1. Blutooth standard: Blutooth V3.0+EDR， Class 2:33'2. Transmission distance: 10m3. Hands-free4. Stereo audio profile: A2DP5. Frequency: 2.4GHz6. Certified BQB， CE AND FCC7. 3.5mm stereo audio output8. Sleep mode for power conversation9. Power supply: Chargers via mini-USB cable10. Operation time: up to 8 hoursInstructions:If this is the first time you use this device， please pair the device first:1. To enter pairing mode， press and hold the ON/ OFF button for 5 seconds until both red and blue LEDs flash.2. Search for the music receiver on your mobile phone or compatible transmitter. Touch and hold one button to power on and it will automatically search for a compatible transmitter. No any codes to enter if connect with for Apple or for Android device. LED lights beneath the button indicate the device's connection and charging status.3. The devices should now recognize each other and pair. The LED on the music receiver will slowly flash blue after successfully pairing.4. To complete pairing some devices require a pass key or code， please enter "0000".5. Once successfully paired， the devices can be powerd off. To re-connect simply power them both on， no need topair again.Package include 1 x Bluetooth Receiver1x USB Cable1x Instruction Manual