The Ajax EN54 I/O Module (2×2) Jeweller is an addressable wireless input/output module designed to integrate wired third-party devices into EN 54-compliant fire alarm systems. It features two monitored inputs and two relay outputs, communicates via the Jeweller radio protocol with encrypted two-way communication, and provides a wireless range of up to 1,700 m in open space. The module supports automation scenarios, multiple EOL configurations, and a fail-safe mode for critical safety applications.