Left Soft Edge: Built-in smart magnet ensures the lid stays in place and the soft edge won't hurt your hands. Upgrade: Opens a wide variety of jar lid sizes, from 1.5" to 4" in diameter - made of stronger and durable internal materials. No twisting, no pulling, no pain - the best kitchen tool for women, chefs, seniors and arthritis sufferers Energy Saving: This electric jar opener uses very little energy and opens the can very quickly. Easy to Use: Place it on the lid. It automatically opens your jars with the push of a button. The lid is held in place simultaneously with a magnet to prevent damage. Best Quality: Our products are made of good quality materials. Don't worry. We are improving your life experience.