The Master Lock No. 5441EC Bluetooth® Wall Mount Lock Box features a 3-1/4" (83mm) wide metal body for durability. Secure your home or business with the Master Lock Vault System for unmatched security, simplicity and accountability using the latest in Bluetooth lock technology from Master Lock. These locks withstand physical attacks and hacks, protecting your property with military grade encryption and high-security features. Administrators control individual or system-wide lock access with our convenient app and web interface options, while users enjoy simple, secure access to assigned locks or lock boxes.

• Use your smartphone to open and manage your lock with the Master Lock® Vault System compatible with both Master Lock Vault Home and Master Lock Vault Enterprise.
• The free Master Lock Vault Home iOS and Android apps are designed for personal use, supporting up to 10 locks, and allows you to monitor access history.
• The free Master Lock Vault Enterprise iOS and Android app and web interface are designed for business applications working with many locks and many users allowing you to easily monitor access with robust data and audit trails.
• No keys to lose, no combinations to forget. No unauthorized key duplication.
• Backup access using numeric code on lock keypad.
• Share access with others - temporary or permanent.
• Includes mounting hardware for easy installation.
• Low battery notification & reminder on lock box and in app.
• Comes with easy to replace CR123A battery.
• Large storage capacity for keys and access cards.