Features: Dedicated speaker for mini power . Loud and clear sound quality brings you a wonderful listening enjoyment. Equipped with premium magnet that are not easily demagnetized. Rugged metal outer case provides better protection. Long service life, easy to install and use. Specification: Condition: Brand New Item Type: Moving Coil Speaker Purpose: Amplification Rated Power: 3W Rated Impedance: 4Ω Frequency Response: 170kHz Directivity: All Sensitivity: 100dB/W SNR: 1dB Harmonic Distortion: 1TMD% Maximum Diameter: 4cm/1.57in Magnet Part Diameter: 2.2cm/0.87in Thickness: 2cm/0.79in Package List: 2 x Speaker