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Napco Gemini Wireless Recessed Door/Window Sensor


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Compatible With GEM Wireless Systems

You can easily monitor a door or window with the Napco Gemini Wireless Recessed Door/Window Sensor, designed for use with a Napco GEM-series wireless system. When your door or window is opened, the transmitter will send a signal to your GEM system to trigger an alarm. It’s that simple.

  • For recessed use in both windows and doors
  • Powerful wireless transmitter
  • White housing, magnet and hole cover

When battery voltage drops below normal, the transmitter will send a low-battery report to your receiver. You can replace the battery with a Duracell DL123A or Varta/Power-One CR123A). Each transmitter has a unique factory-programmed code (printed on the board and also on the transmitter tube) that distinguishes itself to the receiver.

Gemini Wireless: Proven To Outperform The Competition

Napco’s crystal-control Gemini wireless products have been proven by an independent testing laboratory to outperform competitive products, with long-range RF reliability, as much as 50% higher than other brands. Gemini’s uncommon crystal-control precision and omnidirectional circuitry, ensures the wireless/hardwire systems you provide your customers will dependably deliver the security and trouble-free, peace-of-mind they deserve for many years to come. All Gemini panels and receivers seamlessly support the full line of Gemini transmitters and virtually all panels, keypads, receivers and peripherals are compatible with each other and work the same, model to model.


  • Power Supply: 3V type DL123A lithium battery (included)