I was pleased when i purchased this product. It worked as promised, and although it was slightly inconsistent in response, the only real issue was the battery had to be changed(it appeared) every few days. However after a month or so it's range is only about 10 feet,and will not go through walls. This is with a new regular battery and a freshly charged transmitter battery.Someday one of these products will work consistently, they all have problems.