The 2GIG DW100-345 is a wireless door and window contact sensor designed for reliable perimeter intrusion detection. Operating on the 345 MHz frequency, it instantly signals the alarm panel when a protected door or window is opened. The compact, low-profile design allows discreet installation while maintaining consistent performance. Battery-powered for flexible placement, it integrates seamlessly with compatible 2GIG and other 345 MHz security systems, making it a dependable choice for residential or light commercial security setups.