Using your Deejo Art Nouveau Style Pocket Knife is a breeze. To open it, just use your thumb to slide the blade out until the liner lock clicks into place, keeping the blade secure. When you're done, press the liner lock gently and fold the blade back in. It's so light that you can carry it in your pocket or on your keychain wherever you go, like on hikes, camping trips, or just for everyday use. As for maintenance, after each use, wipe the blade clean with a dry cloth. If it gets wet, dry it thoroughly to prevent rust. Don't use it for tasks that are too heavy - duty, as it's an ultra - light knife. And always keep it out of reach of children. With proper care, this knife will serve you well for a long time.