Widely used in telephone times, calling devices, time pieces electronic toys, satety equipments, RFID. Specifications SFM-20-C Rated Voltage(V) 12 Voltage Range(V) 6-24 Rated Current(mA) ≤ 10 Sound Output(dB) ≥ 90 Resonant Freq(Hz) 3000± 500 Operating Temp(º C) -20~+45 Storage Temp(º C) -20~+60 Weight(g) 3.5