Power: Rated Power / Maximum Power 3.0W / 3.5W.Impedance: 8 Ohms Plus/Minus 15%.Size: 70 mm * 31 mm * 16 mm / 3.1 inch * 1.2 inch * 0.63 inch (L* W * T).Applied to Arduino, Robot, Raspberry Pi, Advertising Machine, Game Machine, Integrated Machine Special Speaker etc, Projects.Wiki: http://www.cqrob...