NPGEMRTRANS
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.
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.
Napco’s crystal-control Gemini w