SLOTO389 RTP SLOT You will see a pattern of holes in the backplate. Using wood screws, toggle bolts, or other suitable fasteners, attach the plate to the wall at the place you have chosen to position the sounder. Mount the backplate with enough fasteners to hold the sounder solidly in place. Make sure that the plate is mounted right side up, and that the correct side is forward.|Alvaro de Loyola Furtado