tender for portable oxygen gas concentration detector with digital display for o2. 40 hours or more ofcontinuous operation with a single aaa battery, compact and lightweight approx.130g. sounding alarm, threeflashing lights and vibrations,alarm sound more than 95db/ 30cm. ingress protection ip67 water & dust proof.can be used outdoors on a rainy day intrinsically safe (ex ia ii ct3 & atex) sensor life of atleast 2 years withgovt. approved certification .