The BW Clip Portable Carbon Monoxide detector by Honeywell for detecting Carbon Monoxide. Texas Safety Supply is an online supplier of gas detectors and gas monitors. The BWC2M is a maintenance free device that will operate two years maintenance free. No need for calibration, sensor replacement or battery charging. A favorite of many requiring Gas Detectors because of the lightweight design and clip for easy carry and attachment to clothing. This portable carbon monoxide gas detector is designed to hold up to rough and tough handling and keep going. Also designed for Extreme Texas Summer time heat. The BWC2M has an automated self test, a wide angle Flash and both an audible and vibrating alarm. Logs the 35 Most recent Gas events and bump test results.