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Nortek: Supervised 5-Button, 8-Channel Handheld Transmitter The Model DXS-25 Supervised 5-Button, 8-Channel Handheld Transmitter is a supervised, digitally coded radio transmitter designed for use with Linear’s DX and DXS Format receivers. Pressing a button on the transmitter sends a digitally coded wireless signal to its companion receiver. To send a complete signal, press the transmitter button for a minimum of 2 seconds. The top button can be hidden with the top button cover supplied. Complete RF supervision Alarm, supervisory, and low battery transmissions, Unique "Extra" top button.