It is made of low-density aluminum alloy material, good thermal conductivity, good corrosion resistance, and high strength. It features a 4-digit combination lock for security and a keyhole for up to 5 keys. It has a strong push-button code on the box that allows the person you tell the code to access your key. Easy to install and includes all necessary mounting hardware to ensure the box can be mounted on any sturdy surface. Ideal for outdoor use, after-school children's daycare, cleaning or maintenance services, tourism facilities, and senior care providers. Specifications: Condition: 100% Brand New Color: Silver + Black Material: Aluminum Alloy Size: (L) x (W) x (H) 115 x 95 x 38mm / 4.53" x 3.74" x 1.50" Package Includes: 1 x Wall Mount Key 1x Storage Block 1x Pack of Mounting Screws English Instruction Manual