Function: M10-ORB, It has 3 unlock options: M1 card, Pass code or Mechanical Key. ORB finish color Max of 1000 Codes + Cards users. Keypad illumination, waterproof. Code users can change the code by their own, no need to know master code, the one who knows master code can easily add or delete normal users. Pass word protect funtion, you can input many digits before and after your code to open the door, for example, your code is 666666, you can input 12352+666666+98658 to open the door, total length must be less than 20 digits Double user function,when this function is enabled, you need to input two open lock ways to open the lock, for example, one code+ another code, one code+card, two cards, etc. Handle Orientation for this lock is easily Reversible The orientation of this lock is default for right hand. If you need left hand direction,simply follow the instrution in the package or ask video guide from seller to change the direction. Standard Single Latch,backset for 2-3/8" and 2-3/4" both available in the packing Package includes 2 M1 Cards, and 3 Metal Keys and necessary fitting components. Dimension Diameter of plate: 2.75"(70mm)*8.27"(210mm) Latches with backset of 2 3/8"(60mm) or 2 3/4"(70mm) adjustable Handle length:5.52"(140mm) Passage mode available when enter into this mode, the lock won't automatically lock after open once, no need to input code every time for a busy door Voice Navigation While Operating, make it much easier when program the lock In case of dead battery The lock will alarm when the battery voltage is lower than 4.8V, You can use keys to open the door(move away the key hole cover first). there is a small maget in the key, use this key or other magnet to remove the key hole cover to insert keys Video Guide available Well Made for exterior doors For interior doors For office