Features: The horn is all frequency effect, the bass is very strong, the equivalent of traditional loudspeaker 8 inch bass effect. Latest innovation, break through tradition limitations, 360 frequency transmission. Since there is no body standing wave, so all kinds of vocal music original, the sound quality of each sound frequency range is very clear. Sound penetration is strong, small size and convenient. Suitable for computer, laptop, MP3, MP4, CD, mobile phone and other equipment sound playback and sound expand. Specifications: Color: steel Impedance power(Optional): 4 25 w; 8 20 w Type: electrodynamic (moving coil) Shape: round Diaphragm material: non-paper Magnetic circuit form: internal magnetic type Frequency characteristics: full spectrum band (full range) Rated power: 20W Frequency response: 20HZ -- 20KHZ (kHz) Directivity: positive Sensitivity: 95 (dB/W) Noise ratio: 90 (dB) Harmonic distortion: 5 (TMD %) Size: 50 * 50 * 30 mm/1.97*1.97*1.18inch Weight: 268 g Package Included: 1 x Vibration Speaker