cout Personal monitor detects gases from Ammonia to Sulfur Dioxide. Battery Management Technology (BMA) provides up to 50 hrs. of run time. Wireless charger available. Modular component assemblies minimize down time. Performs routine software and electronic diagnostics whenever unit is powered up for use. Sliding Intelli-Shutter switches Scout between diffusion and sampling modes. Optional integral pump allows user to take samples from up to 100 ft. away. In the event of a pump failure, unit continues to operate while user plugs in new pump.