I would not view the claim of 150 feet range by one commercial unit as reliable. Unless you know a lot more about the company providing this unit, their history, user reviews and published data of results the claim must be treated as possibly false. The field of ultrasonic control device is rife with charlatans. Some may be good, solid providers, others are sincere but don't have a sound basis for their devices effectiveness and others are full on lying, with devices that don't even have measurable output. It is a good field for scammers as proof of defectiveness is hard to come by.