Rated voltage(VDC) 1.5 3 5 12 Operating voltafe(V) 1~2 2~5 4~8 8~15 Rated current(mA) ≤20 ≤30 Sound output at 10cm(dB) ≥75 ≥82 ≥85 Resonant Frequency(Hz) 2300?00 2300?00 Operating Temperature(℃) -20~+70 Storage Temperature(℃) -30~+80 Weight(g) 2