The main hardware component that we need is the iBeacon. We have used the one that is shown at http://redbear.net. Many products are available on the market at almost any price. When choosing an iBeacon, make sure that it is compatible with the iBeacon Apple protocol, since there are products that are not.
An iOS device as an iBeacon
If you have two iOS devices, you can use one of them to act as an iBeacon that running via one of the apps that are available on the iTunes store. I have published my own app for this purpose, which can be found at http://apple.co/1hmZt80.
Depending on the iBeacon enclosure, it can be mounted inside or outside the garage. It is better if it is placed at a higher position. Usually, the battery that powers ...