The Mobile Outfitters 296656 RV Lock with Remote Fob Integrated keyless entry locking system for RV entry doors designed to be highly secure Purchase additional key fobs (302344) and up to ten devices can be synchronized to an owner's unique code Heavy-duty steel locking mechanism and wiring is consolidated directly into the door handle which makes installation easier Wireless key fob allows RV lock to operate just like the keyless entry system of an automobile Requires an opening of 3-3/4" x 2-3/4"