Specifications:Portable lightweight and sweat-proof design.Built-in microphone.Built-in rechargeable li-ion battery.Clear bass resonance， CVC wind noise reduction， and superior sound isolationSweat-proof: Effectively prevent sweat and rain interfere with headset operation.Caller report， line control answer/hang up/rejection/on-off， redial， mute， volume adjustment.Chinese-English shifting， intelligent one-driving-two， music pause/play， up and down song switching.Type: Bluetooth Wireless EarphoneSound Track: StereoBluetooth Version: Bluetooth v4.1Transmission Range: 10mFit Design: In-Ear OnlyOperating Frequency: 42GHzFunctions: Voice Control， Support for Music， Multi - Point ConnectionBluetooth Profiles: A2DP， AVRCP， HSP， HFPTalk/Music Playtime: Approximately 4.5 hoursStandby Time: 180 hoursCharging Time: Approximately 2 hoursCompatible: for iPhone/Nokia/HTC/Samsung/LG/Moto/PC/iPad/PSP and Other Bluetooth DevicesNotes:Due to the light and screen setting difference， the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bluetooth 4.1 Sports Headset(with Built-in Rechargeable Li-ion Battery)1 x USB Charging Cable1 x User Manual2 Pairs of Ear Buds