NDT-03C Specifications Dimensions SPL (0.3W/10CM) Nominal Input Impedance Resonance Frequency Operating Temperature Weight 15 x 15 x 4 (mm) 90 +/- 3 dB 0.5W (2.00Vrms) 8 +/- 1.6 Ω 800 +/- 100 Hz 030~ +85°C 1.6 Grams