Why, I'm a loss as to why anyone would want to, or care what their fridge is doing after setting the temp on fridge initially. Do you check and look at the fridge at home. If it's too hot turn it down, if the light comes one when you open it it's working.
Wouldn't a independently powered AA battery audio alarm be better bit of marketing. At least while your camping and relaxing you could hear the alarm if the fridge source battery is failing, but to walk around with your tempriture wi fi gizmo, or set up and keep checking a mounted dash gizmo leaves me wondering why. If that is the best ARB have, they need some new inspiration or direction.