Recognizes all common anesthetic gases in the ambient air, before the numbing effect starts. With alarm a blip resounds of an integrated hooter (or by an optionally available add on) and a red LED indicator. Applicable as add on sensor at alarm system MS-650 or as single device, too. Activation/disactivation by the remote control unit of MS-650. Malfunction indicates an automatic self check. Temperature-independent. By request to connect (saves energy). Automatic adjustment to the ambient air. Integrated relay of operating current. Connection to cigarette lighter.