HAIFUAN Security Digital Keyless Code Door Lock, Unlock with Code And Key(HFAM5-R) Easy Installation, No amendment for Door Required, Most People Can Install It By Own Handle Orientation Reversible,Default for Right Hand, Video Instruction Available. 50 Independent User Codes(4-12 digits), 1 master code. Backset is Adjustable Between 2 3/8" and 2 3/4" Suitable for Door Thickness Between 1.2"-2.75"(30mm-70mm), Keypad Illuminates When Touched, Comes with Two High Security Keys. Driven by 4pcs AA Battery (not included). Backup Power Terminal Avaiable In Case Of Dead Battery Diameter of plate: 2.55&#034;(65mm)*8.5&#034;(216mm) Latches with backset of 2 3/8&#034;(60mm) or 2 3/4&#034;(70mm) adjustable Handle length:4.92&#034;(125mm) Perfect for bedroom For office For interior doors