When the kitchen floor is flooded, plumbing has gone bust, and the home insurance man comes around, if you have put any of the following down there then he will probably refuse to pay out on the basis that it was your fault.
In America, most people call these electric cookers crock pots, whereas in the Great Britain they are usually called slow cookers. Crock pots by Rival, DeLonghi, Hamilton Beach, Cuisinart and Toastess are particularly good examples of advanced crock pots. Some of these crock pots are programmable, which allows the cook more flexibility that the slow cookers of twenty years did not.