Product ID KWMB-G2603L Rated Voltage 3VDC Operating Voltage 2~ 4VDC Max.Rated Current 30mA at 3VDC Min.Sound Pressure Level 80dB at 3VDC/ 20cm Resonant Frequency 400± 100Hz Operating Temperature -20~ + 60° C D( mm) Ø 26 H( mm) 17.6 weight 12g