320mAh is the case battery's capacity. 32Ω is the speaker impedance. Power rating: 2*5mW Speaker: Φ13mm About eight hours of music at 60% volume Call duration: roughly four hours at 60% volume About 48 hours is the earphone standby time when connected. Input for charging earphones: 5V-30mA Input for case charging: 5V⋓1A Type-C charging input port Approximately three cycles Charge time for earphones: roughly 1.5 hours Approximate case charging time: 1.5 hours IPX4 water resistance Composition: ABS+PC Weight of the earphones: 3.5g Weight net: 38g