Interlogix Tx E221 Recessed Door/Window Sensor

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Interlogix Tx-E221 Recessed Door/Window Sensor Recessed Door/Window Sensor, 319.5Mhz. The Tx-E221 Recessed Door/Window Sensor From Interlogix Is Compact And Robust For Dependable O peration. Hidden Within The Door Frame, This Contact Is Virtually Invisible When The Door Is Closed Making It Ideal When Discreet Sensors Are Needed. The Tx-E221 Recessed Door/Window Sensor Uses A Replaceable Lithium Battery That Lasts Up To Five Years Under Normal Usage And Comes With A Standard Flanged Top. Field Proven Wireless Technology Compact Design Easy Replaceable Battery Wide Gap Up To 1'' Maximum Replaceable Battery With Up To 5 Years Of Battery Life(Based On Usage) Show more