BW Technologies GasAlertClip Extreme Portable Carbon Monoxide Monitor is durable, reliable and maintenance free way to monitor and alert the dangerous levels. 3 yrs monitor features continuous, LCD shows detector life remaining and advises self-test status. Water resistant single gas detector does not require calibration, sensor replacement, battery replacement or battery charging. Detector is equipped with 95 dB tone and bright LED indication internal vibrating alarm for high noise areas. One button interface is simple, easy to use and requires very little training for the user. It includes pocket/belt clip, test cap, lithium battery and concussion-proof boot. It has easy maintenance and compatible with the MicroDock II automatic test system.