The Nittan EV-HIOP-SDR-SCI F16-82061 is a high output sounder, with an IP65 rating as standard. The EV-HIOP-SDR-SCI is a cost-effective wall mounted sounder, and is available with and without a Short Circuit Isolator. The sounder 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.