Features: Cloth with ABS material, overall elegant appearance. Bluetooth 4.2 version, 10 meters lossless sound transmission. Built-in high-definition microphone, wireless call support hands-free. Full frequency speaker unit + professional vibration mode design, low sound mixing. Specifications: Size:190x59x92mm Bluetooth version: 4.2 Bluetooth distance: 10 meters/32.8ft Impedance:4 Euro Sensitivity: 82db Frequency response range: 30hk-20khz Speaker Specifications: 2.75 Inch 4 Euro 5 Watts Output power: 3.5W Battery specifications: 18650 lithium battery 3.7V1500ma Charging voltage: 5V500Ma Standby time: about 30 hours Playback time: 4 hours (maximum volume) Support function: AUX/memory card/call What's in the box 1 x Speaker 1 x Charging Cable 1 x User Manual