Thanks for the reply.please help me understand these two voltage ranges.
These are just the voltages either side of the pwm CCs.
Your info has clarified a few things.
Probably use a few on the fish tanks. Heating or cooling depending on the season
Another possible use is sticking these on the back of a normal fridge to assist...are there any heat sink adhesives?
Been using some VHM-009 over/under battery voltage modules. Very reliable when switching another relay.