The Alfille Temperature Controlled Butter Dish promises to keep butter at your perfect spreading temperature. It plugs in to a wall socket and is intended to operate 24/7. It comes with a pre-set spreading temperature, but you can adjust it if you prefer your butter a bit softer or firmer. It’s designed to keep butter from becoming too hard in a chilly room or too soft in a hot room. The removable butter tray is dishwasher safe, and the tight-fitting lid is designed to keep the temperature constant. The lids are available in white, stainless, black, cream, pink, or pastel blue with your choice of a silver or black base. The Alfille Temperature Controlled Butter Dish is $49.99 from Alfille Innovations.