The Bosch RFDW-SM Door Window Wireless Surface Mount Contact is designed as a security device for door and window monitoring. It features an internal magnetic reed switch contact and operates on a wireless frequency of 433.42 MHz. The device includes supervision for low battery, cover tamper, and removal from the mounting surface tamper conditions, enhancing security integrity. It operates for up to 5 years on a single, user-replaceable Lithium AAA battery, ensuring long-term reliability and easy maintenance.