If you don't have many days to open the box, don't buy this product. It's a waste of money. This product is necessary for people who need to open many boxes. This item provides a fast working speed. KEY ADVANTAGES As the bottom surface of the product slopes inward at a 90-degree angle, it fits perfectly over the edge of the box, ensuring stable, and fast cutting process. the blade is normally hidden, but it emerges when the button is pressed and retracts automatically when the button is released, making it much safer than a standard box cutter. The product can be used in two ways. You can cut the tape on the box by pressing the button lightly, and cut the box itself by pressing the button firmly. How to use it When cutting the top of box when cutting the top of box, think of the safety lock as being where the blade is located and gently pull it down the middle of the box while pressing and holding the button. When cutting the edges When cutting the edges, make sure that the product fits perfectly over the edge and pull it downward to open the box. How to lock There is a safety lock button on the front of the product. When pushed to the left, the product will be locked. How to attach a wrist strap There is a hook hidden on the back for attaching a wrist strap. Push the hook up from the bottom and attack the enclosed strap to the product for convenient use and storage. Package includes The product consists of three parts: - the box cutter (There is a blade inside the product ) - a wrist strap - and two additional blades.