Do I need WiFi or is Bluetooth enough?

Bluetooth-only models (like the Master Lock 5441EC and igloohome Keybox 3) require someone to be physically at the box to use the app, but they generate offline PIN codes that can be shared remotely. WiFi/gateway models let you unlock from anywhere but add a failure point. Airbnb host threads on Reddit lean toward offline-PIN models for reliability; remote-unlock fans prefer gateway-based boxes.