Probably nothing. The advantage of the UnLatch series is that it replaces the standard ANSI 4-7/8" strike plate without any cutting or modification. If you already have the door prepared for a 4-7/8" strike plate you are ready to go. Just verify that there is sufficient space in the jam to accept the body of the lock. The UnLatch requires 3-3/8" Long, 1-3/8" Wide, 2" Deep while the Mortise UnLatch requires 3-3/8" Long, 1-7/8" Wide, 2" Deep.
The UnLatch works with a cylindrical type spring latch or dead latch. The Mortise UnLatch works with a mortise lock. You can use the following illustrations to identify you lock:Typical Cylindrical Lock (Use the UnLatch with this type of lock)
Typical Mortise Lock (Use the Mortise UnLatch with this type of lock)
One of the great benefits of the UnLatch is its motor driven mechanism. Unlike solenoid operated strikes that can overheat when the lock is held unlocked for extended periods of time, the UnLatch merely repositions the plungers and then waits for the re-lock command. As a result there is no overheating, as there is no solenoid being held.
There are six wires on the UnLatch. Two are there for power, one to trigger the lock and three to provide an output to show lock status. Therefore, the minimum number of wires required to operate the UnLatch is three. Two for power and one for the trigger.
That depends up on two factors. First what is the operating voltage, 12VDC or 24VDC? Second is what is the gauge of wire? The following chart will show you the allowable distance based upon operating voltage and wire size.