No wiring desired; takes advantage of 4 AA batteries (not incorporated) It’s retrofitable in many RV entry doors and it’s quick to put in Programmable with a 4 digit PIN selection The large buttons are simple to see and use Proximity sensing which illuminates the buttons Picked quality aluminum https://rvdoorproblems27261.tokka-blog.com/7519747/a-simple-key-for-rv-door-problems-unveiled