Dynamic Speaker 8 Ohm 1500 Hz 300mW Nominal 75dB Specifications Dimensions: 22.8 mm diameter x 8.7 mm thick (0.898" x 0.343") Input power: 0.3 W (nom.) / 0.4 W (max.) Cone: Mylar Impedance: 8 ohms Output: 75 dB Frequency range: 1,500 - 4,000 Hz PC mount, 10 mm pitch Through hole mount