Product specifications:Bluetooth version: V5.0Bluetooth protocol: A2DP1.3, AVRCP1.6, HFP1.7Audio decoding: SBC, AACSpeaker: 40mm, 32ΩBluetooth + noise reduction chip: Hengxuan BES2300ZWearing method: head-mounted (wrap ears)ANC: FB, -25dbBluetooth distance: 10MCharging time: <2.5hBattery capacity: 400mAhWorking current: ANC: 11mA, BT: 12mA, ANC+BT: 15mAPower on and off: 1. When BT is turned off, ANC is turned on and off separately 2. Does not support ANC under 3.5 inputAudio input: BT, AUXINMusic control: Vo1+/-, previous song, next song, playback pauseCall control: answer/reject/hang upBare metal weight: 235gWeight with packaging: 440gPacking box size: 8.8x17.3x16cmPacking net weight: 9KGPacking gross weight: 10KGPacking size: 34.5*37*46.5CMPacking quantity: 20PCS/CTN