HAIFUAN Left Hand Digital Keypad Door Lock with Backup Keys, Electronic Keyless Entry by Password Code Combination(For Left Handed Doors Only) Keyless Entry Providing Enhanced Convenience & Security,10 users in total Only for Left Hand Doors, Handle Direction not Reversible.Easy Installation, No Wiring Required, Programmable different codes for your employees or guests, Video Guide Available,Powered by 4 x AA batteries (not Included) Operates indoor or Outdoor, Backset is Adjustable Between 2 3/8" and 2 3/4" 2 Emergency Keys (No Necessary to Open Lock),Troubleshooting Steps(Reset the Lock by Press the Reset Button for 5 Seconds, Then Program Code Again or Contact Seller for Details) Applicable door thickness : 35~45mm (1 3/8&#034;-1 3/4&#034;) Password Length: 1-13 digits Password Capacity: 10 different passwords Powered by 4 x AA batteries (not included) Battery Life: Approx. 5,000 times Alarm for Low Battery Nickel Brusehd Finish Color Use mechanical key to open, or use the out power supply on top of front panel(hidden under the small plastic) The reset button is on the back of front panel, hidden under the small hole, press and hold it for 2 seconds, system will be reset, amdin code back to 0123 Diameter of plate: 2.55&#034;(75mm)*7.87&#034;(200mm) Latches with backset of 2 3/8&#034;(60mm) and 2 3/4&#034;(70mm) both available in the package. Handle length:4.53&#034;(115mm) The handle direction for this lock is <span class="a-text-bold">not reversible</span>, this one is left hand, if you need right hand, please buy from another link remove the key hole cover on handle first (use a magnet to remove it), inser keys, turn 90 degree Remove the middle screw on back panel, use the screw driver to insert through the hole, it will hit the pin of battery case, drop it, replace batteries, then install it back.