ALTAIR 4XR Multigas Detector, (LEL, O2, H2S & CO), Charcoal case, North American charger

Sensor options for CO, H2S, and O2
Patented electrochemical sensors and MSA-built button sensors
Stainless steel and solid electrolyte construction virtually eliminate sensor leakage
Automatically records the last 25 alarm/test events and can communicate data by connecting to MSA Link via built-in IR communication port
No-miss triple alarm system includes bright flashing LEDs, piercing audible alarm, and an internal vibrating alarm
Rubberized armor housing and one-button operation for maximum durability and simplicity