Hidalife Smart Door Lock with Keypad: Revolutionize Your Home Security and Convenience Fits Diverse Spaces Across the US, Ensuring Convenience and Security in One Step Covers Various Types of Doors, Including Front Doors, Bedrooms, Rental Rooms, Offices, and Apartments Product functions： Hidalife smart lock offers versatile functions.With 20 passcodes, access management is a breeze. The auto - lock button (2 - 99s adjustable) and vacation mode add convenience. Features like LED backlight, reversible handle, anti - peep passcode, mute mode, and smart alarm further enhance user experience and security. Product Overall Specifications​： Weight (NW): 1.94 lb​ Product Dimensions: 5.10 in*2.72*0.85 in Handle Size: 2.20 in​ Installation - related Parameters​ Door Hole Size: 2 - 1/8'' (54mm)​ Backset: 2 - 3/8'' (60mm) or 2 - 3/4'' (70mm)​ Applicable Door Thickness Range: 1 - 3/8'' - 2'' (35mm - 50mm)​ Cylinder Size: 1'' (25mm)​ Battery Information​ Battery Type: 9V（Not Included）​ Optimal discharge temperature range of the battery: -20°C to 60°C (-4°F~140°F)-- This is the optimal operating temperature range for most 9V batteries. Note: In extremely harsh battery operating temperature environments, the battery will be over-discharged, which will reduce the battery's lifespan. As a result, the door lock will issue a low battery alarm.For better performance, it is recommended to use alkaline 9.7V batteries. What's in the Box 1 Exterior Assembly 1 Interior Assembly 1 Latch 3 Keys 1 User Manual Strike & Box Screws We also provide a 12 - month warranty and a 30 - day money - back guarantee, backed by 7*24 friendly customer service. Your satisfaction is our top priority.