8.5*8.5*3.2mm SMT Transducer Rated Voltage 3.6V Operating Voltage 2.5-4.5V Max.Rated Current 90mA Min.S.P.L.(@10cm) 85dB Coil Resistance(DC) 16ohm Resonant Frequency 2730Hz Operating Temp -30~+80C Weight 0.5g