Honeywell SPXCDULNHX and BW Technologies MCXL-XWHM-Y-CN.

Honeywell SPXCDULNHX product.
Product video address: https://youtu.be/EdAkYqB4HTE
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BW Technologies MCXL-XWHM-Y-CN
Multi-gas made simple
The easy to wear, slim and compact GasAlertMicroClip provides
affordable protection from atmospheric gas hazards and extended
battery life, especially in cold weather.
Product video address: https://youtu.be/0Oe78lehpeM