Specifications:Color: black， white red， blueBluetooth version: V4.1Profiles: A2DP， AVRCP， HSP， HFPDrive: ��57mm��2Impedance: 16��Frequency response: 20 Hz -20KHzSensitivity: 110dBTHD: <0.1��Operating distance: up to 10m (free space) Bluetooth music time: about 40hrsBluetooth talk time: about 45hrsStandby time: about 1625hrs(around 50days) Fully charged time: about 2hrsHeadset size: 186��85��200mmPackage size: 200��170��85mmHeadset weight : 0.224KgPackage weight: 0.439 KgIn the box: Bluedio T2S headset 1pcCharging cable 1pc��3.5mm Audio cable 1pcUser manual 1pcTips: Pair with the headphones: 1.Long press the MF Button until the blue lamp constantly light2. Open your phone's Bluetooth function to search the device which needs to be connected， search "Bluedio".3. Compatible Devices: IOS， Android ，Windows or Other Bluetoooth devicesFeatures:1. Foldable & Portable， 195��rotary design， to save more space and easy to carry2. ��57mm ultra-big speaker， brings amazing bass for you. But its impedance is only 16��， easy to drive by smart phones， tablets and PCs.3. Bluetooth 4.1， the latest Bluetooth version， brings top speed & power saving & enhanced transmission， superbly compatible with iOS， Android and Microsoft， a perfect match for 4G， standby time up to 1625hrs.4. Comfortable， Newest Ergonomic design， together with artificial leather & memory foam to ensure comfortable wearing5. Line-in audio， to enjoy music without interruption. Line-out audio， to share music with your friends anytime.