Using this Cuisipro jar opener is easy. First, look at the size of the lid you need to open. If it's between 1 inch (29 mm) and 4 inches (102 mm), this opener can handle it. Push the side buttons on the opener to open its arms. Place the opener around the lid and then grip the comfortable handle firmly. Turn the opener, and the lid should come loose easily. When you're done, snap the opener shut to protect your fingers from the sharp stainless - steel teeth. As for maintenance, you can simply put it in the dishwasher for a thorough clean. Just make sure it's completely dry before storing it. Also, be careful when handling the sharp teeth to avoid any injuries.