Diameter: 50mm. Impedance: 32 Ohms. Operating temperature: -20...60°C, -10...40°C. Resonance frequency: 400Hz. Height/thickness: 12mm. Beep type: loud speaker. Sound pressure: 85dB, 88dB. Maximum power: 0.5W, 0.4W. Resonance frequency tolerance: ±20Hz. Speaker type: universal. Impedance tolerance: ±20%, ±15%. Acoustic Pressure Tolerance: ±3dB. Sound frequency: 0...4000Hz