IP65 rated as standard, the EV-HIOP-SDR-SCI is an extremely cost effective wall mounted Sounder and is available in Versions with and without Short Circuit Isolator. It comes with 32 alarm tones (3 Approved) to choose from and individually controlled alarm and alert tones, allowing customers to choose a combination that works for any installation. It is EEPROM Addressed (Programmer) and features FSK signalling protocol for robust, reliable communications.