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Symrun Wireless Earphone Bluetooth Headset For Iphone 7 For Samsung Galaxy S7 S6 S5 Xiaomi Redmi 4 Phones Stereo Earphone Product description Item: Metal Bluetooth HeadsetColor: Black/RedBluetooth Version: V4.1+EDRBluetooth Profiles: A2DP, AVRCP,HFP,HSPTransmit Power: Class2Frequency Range: 2.402 GHz ~ 2.480GHzAmbient Noise: +- 90dBTansmission Distance: 10M (We tested it in a sunny day, without obstructions, bluetooth distance about 25M - 30M)Talking Time: 4-6 HoursStandby Time: 180 HoursChanging Time: about 1.5 HoursCharging Port: Micro USB package include1*Bluetooth headset1*USB charging line1*User manual