Bluetooth solution: BK3266L Bluetooth version: V5.0 Bluetooth protocol: AVRCP,HSP,HFP,A2DP Bluetooth Distance: 10M ANC frequency: 20~500Hz ANC noise cancellation: 20 �¯�¿�½?�?�± 2db Operating frequency: 2.4~2.4835GHz Battery specification: 3.7V/500mAh Charging voltage: 5V/1A Charging time: about 2h Bluetooth duration: about 28h Bluetooth + noise cancellation duration: about 18h Noise cancellation duration: about 60h Accessory: charging cable, 3.5mm Aux cable Color: black, grey, white