High quality PU edge, aluminum bottom, 16 core voice coil, neodymium magnet dual magnetic design. Small size, ultra-thin, very good small full range speaker Magnetic circuit form: internal magnetic Color: black Material: metal Parameters: Power: 3W Impedance: 4 ohm Sensitivity: 83 ±3db Frequency response: 230HZ-20KHZ Voice coil: 16 Core Diameter: 28mm Height: 11mm Package Contents: 2 x Audio Speaker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.