Features Strong Bass: The horn is all frequency effect, the bass is very strong, frequency response is 20HZ -- 20KHZ (kHz), the equivalent of traditional loudspeaker 8 inch bass effect. 360° Frequency Transmission: The vibration speaker has the latest innovation, breaking through the limitations of the traditional, can transmit 360 ° frequency. Clear Audio: 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. Compact Size: The sound penetration of this resonance speaker is strong, small size and convenient to use. Wide Application: This resonance speaker is suitable for computer, laptop, MP3, MP4, CD, mobile phone and other equipment sound playback and sound expand. Specifications: Material: Steel Impedance power(Optional): 4 Ω 25 w;  8 Ω 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: 25W 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 Package List