Applicable Occasions - Bell Alarm is an electric bell that does not produce sparks, suitable for industrial and mining enterprises, government agencies, schools and public places, call or notification signals, as well as family bells, alarms, etc. High Quality Material - Weatherproof alarm, made of stainless steel, hard metal shell, not easy to deform. Pure copper electromagnetic coil with discontinuity and no electromagnetic interference, powerful knocking, stable operation. Large Volume - Emergency Evacuation School Service Fire Alarm Bell. The sound reaches 100dB and is farther and safer. Easy to Install - Alarm Doorbell. 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 installation methods. Product Description < p>Hard metal shell, not easy to deform, the sound reaches 95dB, the maximum range is 600-800 square meters, and