System Sensor Wired Smoke & Heat Detector BK-2WTB
1/2" Recessed, Hardwired Contacts
Batteries, Hardwired Contacts
3/4 & 1" Recessed, Commercial, Hardwired Contacts
This means, when the magnet is next to the contact (the door/window is closed), the circuit is open. Each pack contains 10 contacts and magnets.
This 3/4″ roller reed ball contact uses a special compressed plastic ball to keep it dirt and paint resistant.