Hoi Anonymous,
A switching programme is stored in the myStrom cloud (account to be set up) and accesses the "Switch Zero" via WLAN. If the WLAN is not running, the "Switch Zero" cannot be controlled by the switching programme. However, it can be switched on/off at any time using the button on the side of the "Switch Zero". This means that it cannot be switched on via the switching programme, but it can be switched off.
Best regards, Kurt