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HIGH QUALITY: Our products use pure copper electromagnetic coil, which has intermittent, no electromagnetic interference, powerful tapping, stable operation and long service life. LOUD SOUND: The product uses a hard metal shell, the material is hard, not easy to be deformed, the sound of tapping is loud, and the spread is wide. NOT EASY TO RUST: The surface of our products is electroplated and it is not easy to corrode and rust. EASY TO INSTALL: The product adopts portable wired power supply, which is convenient and quick to install. It can choose the installation method such as hanging wall and ceiling. WIDE RANGE OF USE: Our products are suitable for use in industrial and mining enterprises, government organizations, public places schools for calling or notification signals, and also for home use for doorbells, alarms, etc.