You can view the strength of the Wi-Fi signal by which your Smappee is connected to your router.
First, navigate in your App to the menu "Smappee" . There, select the serial number of your Smappee, then select "Wi-Fi Strenght"
Note, that your smartphone/tablet needs to be connected with the same Wi-Fi network as your Smappee.
On the next page you see the current Wi-Fi signal strength as received by your Smappee.
Now you can try to improve the signal by small changes in the positioning of the Smappee or the router.
Even small position changes can lead to a significant improvement of signal strength.
Note: If the Smappee loses the Wi-Fi signal completely, the signal strength indication is not updated any more.