Gas Vapor Alarm UL 2' Instrument Case - Black Provides protection against accidents caused by Gas Fumes spills or leaks. Remote sensor monitors bilge/engine compartment during and after fueling. Features: * Full 5 year service life * Cost effective technology * Re-engineered “Plug and Play” design * Dual microprocessor technology * Smart sensor block for improved performance * Add 2nd Sensor Block for additional coverage on larger boats * Use 2nd Control Panel to alert those in other areas of the boat