How do I know if my Belkin Wifi Extender is working?

Hello,
Belkin Wireless Range Extender is Working or Not: Belkin WiFi Extender
OFF - no power on the range extender, check if device is properly plugged into a power source.
Blinking Blue - range extender is starting up.
Solid Blue - Your device is connected to the available Wi-Fi network.
Thanks.
For more to go:-
Belkin N300 WiFi Range Extender
Belkin Extender Setup