This indoor smart door lock supports multiple unlock methods including fingerprint passcode app control bluetooth and mechanical keys it features a reversible handle a type c emergency power supply and silent mode compatible with tuya platform powered by four aaa dry batteries suitable for 30mm to 50mm thick doors and fits steel wooden brass and stainless steel doors with fcc certification and 6068 mortise suitable for interior door use. | Luckbyte | | Smart Fingerprint Door Lock with App Control & Touchscreen Keypad | Black | Best Buy