Apply security film on the inside of the window to prevent the window from being smashed in. Clean the side of the window that is inside the house by first spraying it with glass cleaning spray. Wipe the window dry with a soft cloth. Place the window film that has been cut to the same dimensions as that of the window at a hardware store on the floor. Remove the paper backing from the window film. Hold the window film with the sticky side facing away from you. Place the top edge of the window film against the top edge of the window, lining up the left and right sides. Press down on the window film as you run it down the length of the window. Squeegee any air bubbles by pressing the edge of a car window squeegee against the top edge of the film and running it down the length of the window.
A wireless window sensor will not betray its presence while sending a signal to trigger an alarm if the window is disturbed. First open the window and screw a sensor plate to the bottom of the window with wood screws using a Phillips screwdriver. Close the window almost all the way. Slide the sensor receiver plate onto the window sill so that it lines up with the sensor plate. Raise the window and screw the sensor receiver plate onto the window sill with wood screws using the Phillips screwdriver. Open the compartment lid on the back of the wireless transmitter that is connected to the sensor receiver plate. Insert batteries into the battery compartment and close the lid. Place the wireless transmitter on the wall beneath the window sill. Screw the transmitter to the wall with wood screws using the Phillips screwdriver. Press the "Sync" button on the wireless transmitter and on the wireless control panel for the wireless security system to sync the two.
A window security lock will keep the window closed when you want it to be so, yet let you release the lock to open the window at will. Drill a hole partly into the bottom edge of the window on the inside of the home with a portable drill. Smooth the inside edges with medium-grit sandpaper. Wipe the dust and other contaminants from the window sill with a water-moistened paper towel. Place the window lock on the window sill so the locking bar faces the hole. Screw the window lock to the window sill with wood screws using the Phillips screwdriver. Rotate the knurled knob on the top of the window lock clockwise to extend the locking bar into the hole in the window.