The perfect solution to sharing access to keys. Open and manage the key box by entering the code or with a smartphone, through temporary or permanent codes. The number of contacts is unlimited and sharing is immediate. Fully monitor who visits and when through the app and notifications. Large capacity to hold key cards or traditional keys. Long life battery is easily replaceable. Durable solid body has a coated surface to protect the hardware and door finish. Works with the Master Lock Vault eLocks app. Works with Bluetooth 4.0 3-6 Digit Code Length Manual Override Facility Tamper Alert Suitable for Indoor & Outdoor Use Zinc Construction Large Key Compartment App-Controllable Works with Bluetooth 4.0 3-6 Digit Code Length Manual Override Facility Tamper Alert Suitable for Indoor & Outdoor Use Zinc Construction Large Key Compartment App-Controllable