Rated Voltage 1.8VDC Operating Voltage 1.6~3VDC Max.Rated Current 20mA/1.8VDC Resonant Frequency 3100±500Hz Min.Sound Pressure Level 75dB/10cm D(mm) Ø12 H(mm) 7.5 Resonant Frequency 3100±500Hz Operating Temperature -20~+70°C weight 2g