PS4002L Electronic Cylinder Door Lock with Keypad Access – Left Hand Swing Doors Review Gobling May 29, 2018 August 29, 2018 No Comments on PS4002L Electronic Cylinder Door Lock with Keypad Access – Left Hand Swing Doors Review This Programmable cylinder style Digital Electronic lockset stores one (1)Master and Nine (9) individual User codes. The 4 AA batteries last up to six months and are easy to find and replace. Advance Low battery Alarm.