This application notifies when your device is connected with AP.
Basically, you can see Wifi signal symbol when Wifi is available & connected, but you need to open "Wireless Settings" to know the name of AP. Moreover, "Wireless Settings" does not give more specific connection information such channel number, connection speed, and etc.
However, with this application, you can see full AP description in notification bar when your device is connected via Wifi. Very convinient. This is very light-weight.