Bests & Worsts Reviews from Amazon

I decided to give this device a trial and bought two units to place in different locations in my building. Unfortunately, after about six months in use now, I haven't seen any improvement at all. In fact the bats still fly through the area where the units are located. One unit is located at the end of a long corridor above a door, and that particular unit is now soiled with bat faeces so it must mean that the bats are flying straight up to the device and then turning around just before it reaches the unit. Unfortunately, much to my dismay, I have to conclude now that this device is ineffective. Maybe it is the type of bats that are in my area (Caribbean) or some other reason that I am not getting the results that I read about when I read the reviews on it.