The G-tag can communicate up to 10 meters Bluetooth 4.0 LE, it is necessary that your smartphone is compatible with this standard.
The smartphone application allows to measure the distance to the object.
Moreover, she points with audible and visual alert (adjustable) when the Tag is out of Proteus or when it comes within range of the smartphone.
It is a little the principle of the game of hide and seek, you're warm, you're hot, you're burning.
It works, but if you can not see such as your keys, there is no possibility to make the beeping Tag for example.
By cons, use in a car for example, works hard, if you go down in a parking garage, the system will not be able to locate the position of the Tag, as your smartphone will not be under GPS coverage.
Furthermore, the GPS survey is of somewhat random, thus there may be a significant distance between the upstand and the Tag's position.
The price is reasonable compared to a true GPS tracker that will cost very much expensive, but the application needs to be optimized, it is she who brings the functionality to the use of this G-tag.
In any case, to find his keys or an equivalent object, it can help, but to find a car dan, s the street is a bit light.