Features Latest innovation, break traditional restrictions, 360° frequency transmission. Suitable for computer, laptop, MP3, MP4, CD, mobile phone and other devices, sound playback and sound expansion. The sound penetration is strong, small and comfortable. The horn is a whole frequency effect, the bass is very strong, the equivalent of a conventional speaker with 8 inch bass effect. Since there are no standing body waves, so all kinds of vocal music original, the sound quality of each sound frequency range is very clear. Specifications: Colour: steel. Impedance power (optional): 4Ω 25W; 8Ω 20w Type: electrodynamic (moving coil). Shape: round. Membrane material: no paper. Magnetic circle shape: internal magnet type Frequency response: full spectrum band (full range) Rated power: 25 W. Frequency response: 20 Hz - 20 kHz (kHz). Directivity: positive. Sensitivity: 95 (dB/W). Noise ratio: 90 (dB) Harmonic Distortion Factor: 5 (TMD %) Size: 50 x 50 x 30 mm / 1.97 x 1.97 x 1.18 inches. Weight: 268 g. Box contents: 1 x vibration speaker. Package List