asic ParametersWearing Style: Ear-hookPlug Type: Charging Plug USBSound Effect: StereoBluetooth Version: Bluetooth V4.0 + EDR， compatible with V3.0， V2.1， V1.3Transmission Power: Class 2Transmission Frequency: 2.4GHzTransmission Distance: 33 feet (without any barriers. such as walls or other electric products)Communication Time: 6~8 hoursStandby Time: 120 hoursFile Format Supported: A2DP Music Playing， Earphone and Hand-free ModeApplicable Models: iPhone， Samsung， Xiaomi， Huawei and devices with Bluetooth FunctionColor: BlackWeight:11gPacking Size: 13*11*5cm Package Contents1x Bluetooth Earphone1x Charging Cable1x User ManualFeatures1. The earphone can be connected with two cellphones at the same time2. Fashionable and simple design3. Compatible with all devices and cellphones with Bluetooth function4. Support music playing with high quality sound effect 5. Voice reminding function6. High quality imported chip7. Answering， hanging up and refusing calls functions; calling back the last call function8. DSP noise cancellation function Connection steps1， long press the start button until there are BLINKS BETWEEN RED AND BLUE LIGHT， which means the Bluetooth earphone is under connectable condition2， turn on the Bluetooth function of the cellphone3， search the signal of the earphone， the name of which is BT Headset4， connect the earphone with the cellphone How to connect two cellphones at the same time?1， connect the first cellphone by following the steps talked above2， turn off the Bluetooth function of the cellphone and the Bluetooth earphone3， connect the second cellphone by following the steps mentioned above. Then turn on the Bluetooth function of the first cellphone and search the previous connection records “BT Headset” to connect the cellphone with the Bluetooth earphone. At this time， you can enjoy the use of connecting the earphone with two cellphones