The Passport® FiveStar Alarm is reliable, versatile and simple to use. Its compact, durable case ensures long lasting gas detection and provides hands-free operation with the display facing the user. The Passport(®)FiveStar Alarm's advanced software and pushbutton operation translates into less user training while automatic calibration reduces maintenance time. WIth the first real-time atmospheric pressure compensation in the industry, there is no waiting for gas readings to settle down if the pressure changes. The Passport(®)FiveStar Alarm's five-sensor capability, innovative "smart sensor" technology, and advanced datalogging software make it flexible to meet the task at hand. The unique battery "gas gauge" and Pulsecheck(®)Pump help provide reliable gas monitoring for the whole job. With its two-year/lifetime warranty and the leading poison tolerant combustible sensor, the Passport(®)FiveStar alarm provides years of dependable, low maintenance operation.