Description The Veeder-Root 790091-001 provides remote audible alarm via output relays for alarm conditions identified by TLS monitoring systems. Acknowledgment Switch allows operator to remotely turn off audible alarm. Requires a Four-Relay OutputInterface Module or a Two-Input/Two-Relay Output Interface Module in TLS-350 Series consoles. The TLS-450PLUS is equipped with one internal output relay. If more relays are required on the TLS-450PLUS, use UIOM332813-001 (factory installed) or 330020-620 (spare part). The TLS4c and TLS4i are equipped with two internal output relays. TLS-300 Series consoles are equipped with Two-Input/Two-Relays as standard equipment. Key Features Economic solution that allows alerting of multiple tanks Periodic testing is easy and does not require spare parts Not susceptible to failures from tank tightness or pressure Meets revised 2015 EPA UST regulations for overfill protecting equipment when used alone or in conjunction with an automatic shutoff device Allows user to program individual alarm levels for each tank onsite Weatherproof Construction LED Light Bulb with a longer life span, increased energy efficiency and durability, with no UV ray emission and minimal heat generation.