Mini Bluetooth Earphone Feature: 1. Bluetooth V4.0 ear hook earphone, mini and portable, comfortable to wear. 2. Built-in 50 mAh polymer battery. Up to 4 hours of continuous talk time, 3 hours of music time. Standby Time is up to 120 hours. 3. Charging indicator: the battery status will display on your phone. (suggest use adapter for charging) 4. Long pressing on the button you can into pairing mode, and quickly double-click you can switch to English or Chinese Mode until the indicator blue & red light is flashing alternately. 5. Support 99% of bluetooth-enable devices,such as mobile phones, laptop computer etc. 6. Support IOS, Android, Windows System and MAC OSX System Specifications: Item Name: Mini Bluetooth Earphone Bluetooth Version: V4.0+EDR Impedance: 32 Sensitivity: -42dB Frequency range: 20-20KHz Transmission Power: Class 2 Transmission Range: 10m Radio frequency: 2.402-2.480GHz Color: White, Black, Beige Music Time: 1-3h Talk Time: 2-4h Standby Time: 120 hours Charging Time: About 2h Battery Type: 50mA rechargeable polymer battery Output Power: 30mW Power System: AC110-220V / DC5V USB Cable Length: Approx. 5cm Size: 16*15*28mm Package: 1x Mini Bluetooth Earphone 1x USB Cable (Without Charger) 1x User Manual Note: The bluetooth is only for one ear, not a pair.hone Samsung Huawei Xiaomi Sony etc.