The POLI multi-gas detectors offer 4 or 5-gas monitoring of Oxygen (O2), combustibles (LEL), toxic, Carbon Dioxide (CO2), and volatile organic vapors (VOCs). The MP400 and MP400P are basic models of O2, LEL, Carbon Monoxide (CO), and Hydrogen Sulphide (H2S) configuration in diffusion- and pump for compliance application. The MP400S adopts a full range of sensor selection, e.g. electrochemical (EC), pellistor, non-dispersive infrared (NDIR), and photo-ionization detector (PID) in pumped version. An option of wireless communication enables real-time monitoring of gas readings and alarm status including Man Down Alarm from remote locations for better visibility and faster response.