Using the device outdoors, it is more directional with the sound so place the device with the speakers pointing at the infested area, similar to pointing a flashlight where you need it. On the inside, the sound does bounce off of hard surfaces, such as walls, ceilings, and even furniture. Try not to obstruct the front of the device as we do not want it muffled but filling up the area with sound. Again, similar to a flashlight, obstructed you can’t see much, but unobstructed even a small light can fill a room.