Thomas & Betts DH994 Carlon Mechanical Entry Chime by Thomas & Betts 
This mechanical entry chime uses no batteries and no wiring needed. Single door operations, mechanical operation works without electricity. Chime magnet pulls away from the door frame causing magnet to hit the chime bar to alert you when someone enters/exits the door.Read more Thomas & Betts DH994 Carlon Mechanical Entry Chime
Thomas & Betts DH994 Carlon Mechanical Entry Chime Feature
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