Flashing buzzer,buzzer with light, alarm buzzer 1)Buzzer Light available color: red, yellow, green 2)Buzzer volume>80db/10cm Flashing buzzer,buzzer with light, alarm buzzer1)The buzzer is inermittent sounding and flashing ,with 10cm/80db,current 15-20ma.2)All shorter types are suitable for mounting holes φ22 and φ25, no additional parts need to be added.dc power supply can be replaced by ac.