Bluetooth protocol: V5.0 Frequency range: 20HZ-20KHZ Charging voltage: 5V Sensitivity: 88DM SN-to-noise ratio: 90db Horn impedance: 32 ohms + 15% Horn specifications: 25mm Operation range: 10m Charging time: 2H Service duration: 10H (50% volume) Battery capacity: 300mAh lithium battery Bluetooth name: BT-music Colour:A: black Material:Polyester cotton+plastic Package Contents: 1 x Speaker 1 x Charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.