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Enjoy your music while on the go. Water resistance: IPX8. Case can be wirelessly charged. Built-in lithium battery can be charged with the included micro USB cable. Operating distance: 30'. Driver: f6mm. Impedance: 16?. Maximum power input: 3mW. Max Power Output: 5mW. Sensitivity: 92dB. Frequency response: 20Hz-20KHz. Charging time: 1 hour. Playback time: 6 hours. Gift Box Dimensions: 4.92"L 4.92"W 2.17"H.