Applicable Occasions -- Bell Alarm is an electric bell that does not produce sparks and is suitable for industrial and mining enterprises, government agencies, schools and public places equipment, call or notification signals, in addition to family chime, alarm, etc. High Quality Material -- Weatherproof alarm, stainless steel, baked enamel construction. Hard metal shell, not easy to deform. Pure copper electromagnetic coil with discontinuity and no electromagnetic interference, powerful tapping, stable operation. Large volume -- Emergency Evacuation School Service Bell Fire Alarm Bell The sound reaches 100dB, and it is farther and safer. Easy to install -- Alarm bell Portable wired power supply, easy to install, can be installed on the wall, ceiling and other installation methods. Wired portable power supply, easy to install, can be installed on the wall, ceiling or other methods. Product Description Carbide shell, no easy to deform, the sound reaches 95dB, the maximum range is 600-800 square meters, and it is farther and safer. Portable wired power supply is easy to install and can be installed on the wall, ceiling and other installation methods. Can be widely used in fire rescue, emergency evacuation, factory alarms, doorbells. school, etc. Choose 24V according to the voltage you use. Electric bell Electric bell AC 220V Electric bell DC 24V