Bluetooth speaker features: Bluetooth v4.0 Fashionable streamline design with patent 50mm speaker unit Handsfree function Aux line-in External volume adjustment buttons Product parameters: Output: 3w Bluetooth standard: v4.0 Speaker: 50mm Built-in battery: 3.7v 500mah Input voltage: dc 5v Charging time: 2 -3 hours Playing time: up to 6 hours Impedance for speaker: 4¦¸ Thd: ¡Ü1% (1khz/1w) Snr: ¡Ý96db Frequency response: 100hz to 18khz Reception distance: ¡Ý10m Dimension: 71(dia) x 74(h)mm