The 2GIG DW20E-345 eSeries Encrypted Recessed Door/Window Sensor offers virtually invisible perimeter protection with the enhanced security of eSeries encryption. Designed to be concealed within door and window frames, this sensor provides a clean, professional installation while protecting against signal interception and tampering. It communicates on a fully supervised 345 MHz wireless frequency exclusively with 2GIG eSeries security panels (GC2e, GC3e, Edge).Its compact 2-1/2-inch housing allows for discreet installation in most door and window types. The sensor includes robust anti-tamper supervision and reports its status, including low battery conditions, to the panel. Powered by a long-lasting CR2 lithium battery, the DW20E-345 can provide up to 7 years of typical operation, minimizing maintenance. A powerful rare-earth magnet ensures precise open/close detection. This sensor is ETL listed, ensuring it meets professional security system standards for reliable, code-compliant performance.