 Introducing the 2GIG DW10E-345 encrypted wireless door window contact. With encrypted protocol for enhanced sensor security, this device will operate on the 345 MHz frequency. Fully supervised by the control panel, you will always know whenever there's an issue with this device. Supports both internal and external contacts, allowing for integrations of normally closed hardwired devices. With dimensions of only 2.59 inches, by 1.03 inches, by 0.49 inches, and a weight of only 1.01 ounces, this device is small and discreet. 350 feet open air line of sight range means that you will not have connection issues with these devices. Operating in temperatures of 32 degrees to 120 degrees Fahrenheit, this device is extremely durable. Ladies and gentlemen, introducing the DW10E-345 from 2GIG. Thank you for your services.