Attention: Welcome to my shop We ship the product from China, the delivery time is 7-14 daysSpecificationNoise reduction of Noise Cancelling Earbuds is Up to 35dBHi-Res Audio compatibleLong battery life :- Listen music/talking at Noise Cancelling mode or monitor mode: 19hours- Listen music or talking at Noise Cancelling off: 34Hours- Standby at NC on/ off: 37/350HoursCharging port: Micro USBImpedance:32 ohmDriver size:40mmBluetooth version:V4.1Operating distance: approx 33ft/10mFrequency Range:20Hz~20KHzBattery Capacity:400mAhANC Microphone:4PCS in the Noise Cancelling HeadphonesTalk Microphone:1PC in the Noise Cancelling HeadphonesANC Type: HybridTips:1.Unplug the 3.5mm audio cable and the headphone will be turned off.2.Theres no voice prompt during the switch between noise cancelling function and other modes.