Generic Small Surface Bone Conductor Transducer Exciter with Wires 8 Ohm 1 Watt Dimensions: 21.5 x 14.5 x 7.9mm, Weight: 9.6g Impedance: 8 ohm, Re: 5.8 ohms Power handling: 1 watt RMS/2 watt max, Le: 1.26 mH Frequency response: 300-19,000 Hz (but will vary with what you use as the transducer surface) SPL: 90.1 dB 1W/1m (but will vary with what you use as the transducer surface)