SoHoMiLL YL 99 Electronic Door Knob (Spring Latch LOCK; Not Smartphone Connected; Not Deadbolt), 2 3/8" x 2 3/4", Satin Nickel Easy setup: master code, passage code, and up to 8 user codes - all controlled by your master code Fits both left and right-hinged doors; heavy duty design (stainless steel) and all-weather Design for Do It Yourself (DIY), and Easily replace most existing door locks, outdoor or indoor Auto-lock from outside in three seconds after entry to ensure max. security Low battery warning, plus backup battery box jumper (AAA batteries NOT included)