B7054-28-01 / 54-28-01 MONITOR 90 DAY DISPOSABLE Mighty-Tax Disposable Single Sensor Gas Detector Disposable, small and rugged, the Mighty-Tax has a bright LED and two-tone alarm for 35 ppm and 100 ppm CO (carbon monoxide). It provides 90 days of detection from the time of activation and begins to chirp periodically seven days prior to shutdown. The detector contains an accurate electrochemical sensor sealed in an RFI-protected metal plated ABS case that weighs less than 1 oz. and features a built-in test button. Steel clip attaches to belt collar or hard hat Bump test adapter and operator's guide are also included.