The Cel Fisat is a device used to boost mobile signals, both indoor and outdoor. The types of area that might benefit from this product could vary. If you live in a region where there are poor mobile coverage or no signal at all, Cel Fisat will help boost your cellular signal so that you can make calls without talking over static, clear as day. The device is also great for those who travel around areas that have low to no reception but need to make and receive calls while they are out and about.