BC-3A Electronic Buzzer Engineering plastic is adopted for shells of BC-3A Electronic Buzzer, and electronic integrated circuits for inner cores. BC-3A Electronic Buzzer is featured with light weight, waterproof, anti-shake and easy installation, etc. It is the best choice for safety alarm of lifting machines, gantry crane, bridge crane, overhead traveling crane and heavy duty equipment in metallurgy and mine industry. It can be customized according to the user¡¯s special requirements Operating Voltage: (Optional ) AC24V-380V DC12V-220V Supply Frequency: 50Hz-60Hz Power of Sounder: 10W Sound level: 106 dB Protection Grade:IP56