[header] How to set up a wireless home security system [title] Set up the door and window sensors. [step] Doors and windows are vulnerable areas of your house or apartment through which a burglar can break in. Once you attach these sensors the corner of your doors or windows, they'll be able to detect whenever your access points are open. 
Your door and window sensors keep you safe when you're at home during the day and moving around your house. [substeps] The door sensor comes in 2 pieces-the bigger half is a wireless transmitter and the tinier piece is a magnet that completes the circuit.