The Ajax EN54 FireProtect (Sounder) Jeweller is a wireless acoustic alarm device designed for EN 54-compliant fire alarm systems. It operates using the Jeweller radio protocol with encrypted two-way communication and provides a wireless range of up to 1,700 m in open space. Featuring an acoustic output of up to 100 dB, synchronized alarm tones, and a robust housing, it is suitable for indoor and outdoor installations.