Features:Bluetooth + stereo headset combo + MP3 player + FM radio.Perfect for iPhone， Samsung Galaxy's， HTC's or any other device that has Bluetooth capability.Built-in microphones for clear conversations， allow you to answer/reject phone calls anytime and anywhere.Supplied with a 3.5mm cable that you can use to connect the headphone to devices without Bluetooth.Support TF/Micro SD memory card.With FM function， can listen to the FM radio.Up to 10 hours playing time， talking time up to 6 hours， and standby time 250 hours.Powered by the lithium battery (can be charged via USB).Adjustable length hinges and soft earmuffs for comfortable wearing.Foldable design for easy carrying and storage. Specification:Bluetooth version: V2.1+EDRBluetooth protocol: Hsp/Hfp/A2dp/AvrcpOutput power: Class IIOperating distance: 10m / 32.81ftOperating frequency: 2.4 to 2.4835GHZInput voltage: DC5V Working time: 10 hoursTalk time: 6 hoursStandby time: 250 hoursCharging time: Approx. 2.5 hoursPlug type: 3.5mm stereoColor: Blue/Black/WhiteAudio cable length: Approx. 1.2m / 3.94ftHeadphone size: Approx. 18.5 * 8.5 * 19cm / 7.3 * 3.3 * 7.5inHeadphone weight: 213g / 7.5oz