Versatile Door Compatibility: This smart lock is designed to fit a wide range of door types, including wooden doors, brass doors, stainless steel doors, and steel doors, making it suitable for various residential and commercial installations Multiple Unlocking Methods: Offers flexible access options with card, mechanical keys, password, Bluetooth, and e app control, providing both convenience and security for users High User Capacity: Supports up to 200 card users, with no limit on password capacity, making it for households or small businesses with multiple users needing secure, easy access Reversible Handle: The lock features a polished finish for a sleek look, and the handle direction is reversible for ease of installation, adapting to different door configurations Reliable Power and Temperature Range: Powered by 4 AA dry batteries (not included), the lock operates in a wide temperature range of -20°C to 70°C, ensuring reliable performance in diverse environments. Note that this model is not waterproof