Completely portable and easy to use, the UniMAX Personal Single Gas Detector ships calibrated, with three new AAA alkaline batteries, ready for immediate use. The nine available plug-in sensors can be changed in minutes and are automatically recognized by the microprocessor. Mode functions include peak gas reading, calibration, battery condition, and alarm setpoint. The UniMAX features audible, visible (flashing red LED) and optional vibrating alarm choices. UL classified as intrinsically safe and backed by a lifetime warranty.