Hign-concerned Chemical None Material Plastic Battery life up to[hours] 7 Voice assistant built-in YES Maximum wireless range[m] 10m NFC Technology no Sound Isolating YES Category Earphones Headphones Earcups Type Sealed Number Of Drivers 2 Charging Method Charging case Headphone Pads Material other Driver Diameter 16mm Impedance Range up to 32 ? Bluetooth Version 5.3 Package List User Manual,Charging Cable Features waterproof,With Microphone,Active Noice Cancelling Codecs none With Microphone Yes Is wireless Yes Support APP Yes Support Memory Card No Waterproof Yes Plug Type none Function for Video Game,Common Headphone,For Mobile Phone,HiFi Headphone,Sport Active Noise-Cancellation Yes Volume Control Yes Control Button Yes Vocalism Principle Dynamic Wireless Type bluetooth Connectors None Communication WireLess Style Ear Hook Certification CE Origin Mainland China Brand Name kebidumei Bluetooth Version Bluetooth 5.3 Transmission Distance About 10m Standby time 200 Charging Case 250mAh Music Time 24h Feature 1 Earphones Bluetooth Feature 2 Earphones Wireless Bluetooth Feature 3 Headphones Bluetooth (description exceeds maximum possible length)