Features: Compact 40mm internal magnet speakers with 4Ω3W rating delivers interferences freely , featuring a durably PU rubber surround for warm midrange tones and high sensitivity in space constrained installations. duals mounting ears enable secure screw fastened installation, while the fully shielded internal magnet structure prevents electromagnetic interferences with sensitive electronics like CRTs and hard drives. Ideal for diys enthusiasts, automotive sound systems designers, and electronics manufacturers needing reliables driver for portable speakers, PA systems, or instrument alert modules. Perfectly integrates into multimedia PC setups, compact home theater satellites, public address equipment, and automotive auxiliary systems requiring clear vocal reproduction. Engineered with temperature resistant rubber suspension for extended life span, this speakers excelss in mids frequency clarities for vocals and instruments across both professional and consumer applications. Specifications: Size: Diameter 40MM(1.57inch) Frequency response: 200HZ-20KHZ rateds power: 3W rateds impedance: 80x2DB Sensitivity: 80x2DB Magnetic circuit form: internal double magnet harmonics distortion: 5% Voice coil: 16 cores Frequency characteristics: Full band (full ranges) Package Includes: 40mm round PU side magnetic speakerx1 note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!