The Carbine CEL 3-in-1 Leverset model fits in standard 54 mm lockset hole, no additional drilling required Touch keypad with backlight Key override RFID card entry Works with most NFC enabled smart phones with Mifare compatibility Access codes, RFID cards & phones are programmed through the lock 1 programming code, 25 user codes and 25 RFID cards Codes from 4 – 8 digits Guiding code, ability to enter program false numbers before true code Vacation mode, lock out all users Auto lock delay timer, 5 -99 seconds-Pre set at 5 seconds Double authorization mode possible, card and code C4 keyway 6 pin cylinder , keyed to 5 pin key Suits door thicknesses of 35mm to 51mm Requires 4 AA batteries Fire tested for 1 hour Box Packed Finished in matt black RFID Cards sold separately RFID stickers available to attach to back of your mobile phone CEL-3IN1-SL8SNKIT