Touchless Wave to activate door, compatible with kinds of automatic door opener^^High sensitivity infrared, quick response, Sensoring distance is adjustable from 1.18 nch to 11.8 inch^^Stainless steel metal panel design, with a special bottom box, convenient for a variety of occasions installation. ^^Non - contact induction with hands or reflective objects, clean and hygienic. ^^Small size with 5.12 inch square bottom box, perfectly and easily embedded in the wall