Wholesale Noise CANCelling Bluetooth Earpiece Product Paramenters ChipJerry Transmission distance10M Battery typePolymer battery Headphone battery capacity40mah Charging and battery capacity300mah Headphone charging time30 minutes Charging time of the charging box1 hour Headphone battery life5 hours Talk time5 hours The number of times the charging box can be charged3 times Control methodTouch Maximum delay40 milliseconds Wholesale Noise CANCelling Bluetooth Earpiece website:http://www.zlinck.com/bluetooth-earphone/noise-cancelling-bluetooth-earpiece/