This Single-Gas Combustible Detector from MSA has a straightforward single-button operation which prevents any unintentional operation. The TITAN also has excellent alarm features with four ultra bright alarm LEDs [visible from all sides], sweeping frequency horn, flashing alarm flag on the display and optional vibrating alarm. Extremely durable and reliable – it will stand up to the roughest handling in the toughest environments. Moreover, the TITAN is equipped with a MSA 20 L sensor, which extends its service life. TITAN will take either a NiMH battery pack or an alkaline battery pack, both of which are interchangeable in hazardous areas. Approvals :ATEX II 2G EEx ia d IIC T3/T4,MED 96/98/EC,EN 50014-20, EN 50104, EN 61779, EN 50271