Increased Storage Capacity The interior of this model is indeed larger than other models, internal dimensions: 115 x 80 x 32 mm, for up to 6 house keys. Prevents blockages and provides access to your property for health care aides, service technicians and pet seating when you're at work or on vacation. Perfect key storage solution for AirBnB rentals. Improved Sliding Cover The structure has been redesigned and the opening method is no longer pressing the button but lowering it as a whole, which is very easy. This rain and dust cover is tighter and can prevent dust and rain. High Quality Materials Mainly made of zinc alloys, aluminum alloys and stainless steels, it is high quality and durable. External dimensions: 12 x 8 x 3.5cm. Your key safe has a weatherproof sliding cover to protect the combination dials from the elements. Dial Combination 4 Digits Allows you to personalize your own access code. Hinged lid for one-handed use. The instruction guide allows you to reset your access code at any time. Easy Install 4 screws and 4 nylon anchors Installation method: 1. Open the box inside, there are 4 holes on the back of the box. 2. Hold the box up to the wall and mark the position of the holes with a pencil. 3. Drill holes in the wall. 4. Place the plastic anchors in the wall. 5. Place the box on the wall then screw in the screws provided.