Chip: Bluexun 5656C, single label, Bluetooth 5.4 version MIC: -42db, silicon microphone Speaker: 8mm, copper ring composite film Battery: earphone: 40 mAh/charging case standard 300 mAh Charging time: earphone 1.5 hours/charging case 2.5 hours Product size: earphone 25*14*23mm/charging case 57*45*31mm Product weight: earphone 3.5 g/charging case 24.5 g Product color black, white (custom color acceptable/custom color starting from 3K)