Stream music from your smartphone, tablet, or any Bluetooth enabled device or take a call mid-playlist. Case can be wirelessly charged. Built-in lithium battery can be charged with the included micro USB cable. Bluetooth version: V5.0. Operating distance: 30'. Driver: ?6mm. Impedance: 16?. Maximum power input: 3mW. Max Power Output: 5mW. Sensitivity: 92dB. Frequency response: 20Hz-20KHz. Charging time: 1 hour. Playback time: 5 hours. Gift Box Dimensions: 5.9”L 3.42”W 1.89”H