You will receive four contacts.

This sliding door/window disconnect contact is a must-have for any smart home setup! It is designed to work with a variety of brands and models, including the RadioShack Safe House 49-518. The wired connectivity ensures reliable performance, and it is suitable for indoor use only.

With this door/window sensor, you can keep an eye on your home's entrances and exits, receive notifications when they are opened or closed, and automate certain actions based on these events. It is easy to install and use, and will provide you with peace of mind knowing that your home is secure.