This is a solid, well-built device offering much more coverage than expected. The side dip switches are nice to the touch because I don't always need to turn GPS blocking on and be able to turn it off.
I encountered this pain just last week and immediately tested it. It can really effectively block mobile phone 3G, WiFi and GPS signals.
This product is amazing and works immediately! It comes with a nice protective case and car charger, and I highly recommend this product.