Features:OOTDTY  brand new and high qualityBuilt-in microphone, support digital echo-cancellation technology with digitalBluetooth-compatible 4.1, easy to match device, stable connection, high transmission speed, and strong applicability.Intelligent bluetooth-compatible, wireless high-fidelity, suspended micro high-fidelity sound effect.The music gives you a powerful power. Comfortable and considerate design around the ears to provide you energy whenever you are running, doing fitness or cycling.Ergonomic designed,not only can isolate the distractions around you, but also can let you wear it without fatigue.Specifications:Material:ABSColor:White/BlackOutput power: 32 ohms 45mWFrequency Response: 200Hz-2000HzSensitivity: 120db±3dbSignal-to-noise ratio: ≥90DBDistortion: 0.5%standard: Bluetooth-compatible 4.1+EDRPower supply: built-in lithium battery 190mAhWhen charging: 3 hoursEffective distance: 10 metersWorking hours: more than 10 hoursStandby time: 250 hoursCharging Micro USBSize:Approx. 150x165x35 mm/5.9×6.49×1.37 inchesPackage Includes:1x Bluetooth-compatible HeadphoneNote:1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.