Although the item has been opened once, it is unused. This is a LOCKIN smart lock with waterproof function, featuring a PIN code entry system and a compact, weather-resistant design. ① Easy to install anywhere It can be used in a wide range of places, such as your home, office, car, or walls. You can fix it to a wall with screws or hang it on a doorknob using the included shackle. It can be installed even in places where a smart lock cannot be installed. It is waterproof (IPX5) and resistant to sunlight. It uses sturdy materials also used in cars and building materials. ② Easy opening with app & PIN code Even without internet access, you can send codes remotely. One-time codes or temporary codes can be used. The one-time code is automatically invalidated when the door is opened. Temporary codes are convenient for regular cleaning staff access, etc. ③ Large capacity, perfect as a safe! It's big enough to hold car keys and credit cards. It is also suitable for use as a safe. ④ Operates on batteries and USB It runs on 2 AA batteries. If the batteries run out, it can be powered via USB TYPE-C.