DSC Wireless 1-Way Door/Window Contact with Built-in Reed Switch and N/C External Contact InputBuilt in reed switch. Normally closed external contact input 1 lithium battery included Reliable 433 MHz and 868 MHz technology Available in brown housing Case and wall tamper WS4945N normally open version available.
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DSC Wireless 1-Way Door/Window Contact with Built-in Reed Switch and N/C External Contact Input