Impedance power: 4 ohms +/- 15% Rated power: 15w Sensitivity: 91db Frequency: 90-10k Drum paper: rubber side braided pots Weight: 390g Rated voltage: 7.75v Outside diameter: 104 x 104 x 52Hmm Magnet: Φ70 x 32 x 10mm Voice coil: Φ25.5mm aluminum film Colour: picture color Material: ABS Package Contents: 1 * Audio Portable Speaker Only the above package content, other products are not included. Note: Light 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.