The CL4000GD by Codelocks is a medium-duty electronic patch door lock. The lock’s outside lever can turn freely without operating the latch bolt, and when a valid code is entered and the blue LED lights up, the lever will retract the latch bolt. When the door closes, the spring latch automatically locks the door. A key can also open the door for management functions and may be used to set the lock into code-free mode so that anyone can open the door without using a code. The lock can store up to 80 different user codes that may be four, five or six digits in length. It is suitable for in-swinging doors only and can be used in hospitals, care homes, offices, schools and more.