Chip: Bluexun 5636E, dual microphone/ANC+ENC, Bluetooth 5.4 version MIC: -42db, silicon microphone Speaker: 10mm, copper ring composite film Battery: 40 mAh for earphones/500 mAh for charging case Charging time: 1.5 hours for earphones/2.5 hours for charging case Product size: earphones: 35*23*18mm/charging case: 66*56*30mm Product weight: earphones: 4.2g/charging case: 36.8g Product color: black, white (custom colors are acceptable/custom colors start from 3K)