So I have the gadget pcitured here. It plugs right into the oputlet and you plus your crockpot into the bottom. You press the Cook time button to set it for 4 or 6 hours at high or 8 or 10 hours at low. After the cooking time, it reduces the power so that the food is kept warm. Since I am out of the house for close to 12 horus a day, this works well.
Except when you forget to turn the knob on the crockpot from off to high.
I came home to raw chicken breast in my crockpot. I threw them away and opened a can of spaghetti sauce and boiled a pot of noodles. Maybe next time.