MYDAYS OUTDOORPortable Heated Sleeping Pad,Outdoor Heated Sleeping Bag Liner,Three Heating Zones Great for Cold Weather Camping,Home and Office（Power Bank is not Included）

The liner heats ok does not get very hot but it is good enough in a sleeping bag. The only issue is it only runs two hours at a time. There is no instruction on changing the timer that limits its functionality.

Doesn't stay on. The reason I bought this was to help take the chill off when boondocking. It doesn't stay on more than a few hours. That's pretty worthless. It doesn't get very warm, which was expected as it doesn't use much energy.

There are two things I really don't like; almost no heat to speak of and, more importantly, nowhere in the description that I recall did it say that it only stays on for about 2 hours. Now it's been said.