Honeywell BW Clip BWC2R-H Single Gas H2S Detector is your everyday companion for hazardous environments. It operates for up to three years maintenance-free: Just turn on the device and it runs continuously — no need for calibration, sensor replacement, battery replacement or battery charging. That means great reliability and no downtime. Plus, with the two-year BW Clip for H2S, you can put the device in a hibernation case when you’re not using it for a week or more — and extend its life by that period of time.