product id ksm5020f03-k1308 rated voltage 30vdc operating voltage 3~40vdc max.rated current 25ma at 30vdc min.sound pressure level 75db at 30vdc/1m resonant frequency 4.0±0.5khz tone nature continuous d(mm) ø22.5 h(mm) 8.8 operating temperature -20~+70°c weight 2g dimension frequency response 常州冠威电子有限公司