AP Products 013-531 Electric Motor Home Lock It is powered by 4 AA batteries***. Is retrofitable in most 2-Pin Motorized RV entry doors, and is easy to install. The key will always be able to operate the paddle or dead bolt lock in case of the user forgetting the code or dead battery. The large buttons are easy to see and use. Proximity sensing which illuminates the buttons, Programmable with a 4 digit PIN number.