 Hold the smoke detector with the front of the smoke detector facing toward you, and spin the backplate clockwise to remove the backplate. Install the supplied battery. Refer to the installation manual for best practices on where to mount the smoke detector. The smoke detector can be mounted on a wall or the ceiling. Once you have selected the mounting location, drill two pilot holes using the mounting bracket as a guide. For best results, place the holes in the channel on the left and right as close to the center as possible. Fasten the backplate to the surface using the supplied screws with the flat side of the backplate against the surface. To install the smoke detector, find the raised alignment notch on the outside of the mounting plate. Find the raised alignment notch on the outside of the smoke detector head. Insert the smoke detector head with the alignment notch slightly to the left of the alignment notch on the mounting bracket. Twist the smoke detector clockwise to lock it into place. With the rely panel in programming mode, press the test hush button for up to 30 seconds. You should hear the rely panel. Make sure to subscribe to our YouTube page and click the show more tab underneath the video where you can view valuable links pertaining to this product, similar how-to videos, and our low-cost no-contract alarm monitoring services.