for example you do not want them to be too sensitive, they only need to go off when the door is open and not when a bug gets in the gap. contact us - bulk handling equipment and systems . i’m very happy to announce a new edition of my book, key to your dreams (with dream journal), has been published. you gave us lot of ideas and i find it very creative.also i wish to see lot of new designs from you . we pledge to get the job done on time and on budget the 1st time. 