This is a case that can lock your smartphone for a specified amount of time. One unit is available. If you receive a call, you can remove the clover-shaped silicone on the back to answer it. The color is gray. This product is perfect for a world where smartphones are always in hand, such as: * Ensuring study time for children * Securing time with family There are some minor scratches. There are about 40 of the same item and color, so if you want multiple units, please comment with the quantity you want, and I will create a separate listing. (The price is negotiable, as most of them haven't been checked yet, so it will take some time.) Instant purchase welcome. Included: Original box, instruction manual, USB Type-B cable (the cable is inside the case). There are some parts of the instruction manual that are slightly incorrect in Japanese. Shipping will be via Nekopos (domestic delivery service), and will be adjusted depending on the quantity. Management number