Adjustable alarm points. Alarms are indicated by flashing LEDs, an audible alarm, and internal vibrating alarm. Dust and water protection rated IP67. One button operation. Replaceable battery and sensor. Dust and water protection rated IP67. Concentration displayed on a large, clear, backlit LCD. Automatically records the last 50 alarm/test events while simultaneously recording peak gas readings or low O2 readings every three minutes in a periodic data log. User can read data or change alarm set points by connecting unit to MSA Link via built-in IR communication port. Adjustable alarm set points.