This detector is compact, rugged in design and fully serviceable, featuring simple 1-button operation. Available sensors include O2, CO, H2S, SO2, CO+, CO-H, Cl2, ClO2, NH3, NO2 and PH3. Top and front mounted bright LED. Max, STEL and TWA readings are accessible by pressing the MODE button. Continuous real-time gas readings at all times; even during alarm. Black Box recorder and event logger are standard. All units available with optional vibrating alarm. Up to 9000-hours of battery life. Meets IP65/IP67 water and dust ingress protection. Compatible with the Biosystems IQ Express Docking Station. Meets c-UL-us. Classified for Class I, Div 1, Groups A, B, C, and D T4. UL Classified for Class II, Div 1, Groups E, F, and G. Ships Direct F.O.B. Mfg.