FULLY SUPERVISED MAGNETIC CONTACT TRANSMITTER; DESIGNED PRIMARILY FOR PROTECTING DOORS & WINDOWS; USES A BUILT-IN MAGNETIC CONTACT THAT OPERATES IN CONJUNCTION WITH A MAGNET TO DETECT THE OPENING & CLOSURE OF A DOOR OR WINDOW; EASY TO INSTALL & OPERATE; INCLUDES STANDARD LONG-LIFE LITHIUM BATTERY; BATTERY IS CONSTANTLY MONITORED\, WITH AUTOMATIC REPORTING TO THE RECEIVER WHEN THE BATTERY NEEDS TO BE REPLACED
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