As an Amazon Associate, we earn from qualifying purchases. Nortek Security and Control D-21A Linear Electrical Accessories Nortek Security and Control . D-21A Gallery Attributes Brand name, Manufacturer name, ManufacturerNortek Security and Control CategoryIdL3Electric Locks CategoryL1Windows and Door Hardware CategoryL2Door and Window Security Hardware Extra Product NameNortek Security and Control D-21A Linear Electrical Accessories atoms, moq, multiple, tierMinQty11 MPN, SKUD-21A qtyInStock0 snippet<p>Normally Open Wall-Mount Transmitter, Slimline Case Design, Test/Operate Switch, Test/Operate LED, 2 Second Transmission, 256 Selectable Codes, One N/O Input Loop Circuit, Loop Input Screw Terminals, Powered by one 9 Volt Battery (Included)</p> tierPrice164.9 Distributor offers SellerSKUMOQIn stockMultiplePrices DK HardwareD-21A111 @ $64.90