Specifications: Diameter: 2.0 inches (50 mm); Weight: 1.8 oz (52 g); Rated Input: 0.2 W; Maximum Input: 0.4 W; Impedance: 8 Ω; Output Sound Pressure Level: 83 dB-W/m; Minimum Resonance Frequency: F0: 450 Hz; Frequency Response: F0 - 4000 Hz