General description This wall-mounted key safe box offers high security with a customizable 4-digit code, providing 10,000 unique combinations to ensure the safety of your keys. It is hermetically sealed, waterproof, and rustproof, making it durable enough for both indoor and outdoor use. Technical specifications Material: Zinc Alloy Color: Black + Gray Overall Size: 3.35 x 1.58 x 7.09 inches / 8.5 x 4.0 x 18.0 cm Inner Size: 2.64 x 3.54 inches / 6.7 x 9.0 cm Installation Two mounting options available: wall mounting with supplied anchors and screws or installation on a peephole. Usage Ideal for storing house keys, car keys, or access cards. Perfect for daily activities, emergency entries, pet sitters, and real estate matters. Other information Tips for use: Record your password after each reset, avoid using easily guessable combinations like "0-0-0-0", keep the shutter door closed to resist weather, and rotate the dials weekly for optimal performance.