This carbon monoxide detector should be installed in any garage, workshop or household. The measuring range is divided into 3 different concentration levels: 50, 100, 250 ppm and an alarm is given by an acoustic and optical signal. An LED light indicates a low battery level. The use of the PKI 8520 Gas Warning Device is as easy as can be. Turn on and the PKI 8520 Gas Warning Device is ready to work. The built-in sensor permanently examines the absorbed air and analyses it by means of its microprocessor. In case that the gas concentration found is too high, the corresponding alarm will be given.