UL 2034: STANDARD FOR SAFETY FOR CARBON MONOXIDE ALARMS.
What is ul2075?
UL 2075 : UL Standard for Safety Gas and Vapor Detectors and Sensors.
How do I reset my Simplisafe carbon monoxide detector?
Press and hold the grey button under the words "DO NOT PAINT" and slide the front panel off. Replace the batteries. Replace the front panel and put the detector back on the bracket. Malfunction.