The Door chime - announces visitors as door opens - easy to install - no batteries or wiring needed - muting bar to silence sound - includes chime, mounting plate, metal disk, and mounting hardware• a small round magnetic disc is connected to a rod and the magnet attaches to a metal disc (which is attached to the frame or door) when the door is closed. The rod that is connected to the magnet is pulled off of the metal disc when the door is open, and the other side of the rod hits a metal plate (like one from a xylophone) which causes the chime sound.
WARNING: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm
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