Specifications:<br> Color: steel<br> Impedance power(Optional): 4 Ω 25 w; 8 Ω 20 w<br> Type: electrodynamic (moving coil)<br> Shape: round<br> Diaphragm material: non-paper<br> Magnetic circuit form: internal magnetic type<br> Frequency characteristics: full spectrum band (full range)<br> Rated power: 25W<br> Frequency response: 20HZ -- 20KHZ (kHz)<br> Directivity: positive<br> Sensitivity: 95 (dB/W)<br> Noise ratio: 90 (dB)<br> Harmonic distortion: 5 (TMD %)<br> Size: 50 * 50 * 30 mm/1.97*1.97*1.18inch<br> Weight: 268 g<br><br> Package Included:<br> 1 x Vibration Speaker<br>