There's something off.
What is off is that this device can't do that. It might be somewhat approximate for calories burned while walking or running, where you're "stepping", but not for just plain old everyday movement. That's why it's so low.
At 80c per 3 hours, you'd burn, if you kept up that activity all 24 hours, less than 700 calories in the entre day. Now we know that has to be wrong! It's wrong because it can't do calories burned for that kind of thing.