The Gasgard XL Controller from MSA is a versatile and easy-to-use controller for monitoring toxic and combustible gases and oxygen deficiency. This controller provides protection from potentially hazardous conditions in a variety of applications. The Gasgard XL Controller offers reliability in a compact, durable, wall-mounted housing constructed of fire-retardant ABS plastic and can be easily configured to accept up to eight remote gas sensors.MSA,, (800) MSA-2222.