Why Choose Thlevel Smart Key Lock Box? For Homeowners Say goodbye to hiding keys under mats! Grant temporary access to babysitters or contractors without compromising security. For Airbnb Hosts & Realtors Eliminate in-person check-ins. Generate unique codes per guest and auto-expire them after checkout. For Property Managers Centrally manage access across multiple units. No more costly lock changes between tenants! Specifications Material: Zinc alloy + ABS plastic Battery: 3x AAA (not included) Compatibility: iOS 10.0+/Android 6.0+