If there is no Internet connection on site, the TrickleStar App can still work in LAN mode if the mobile device is connected to the same Wi-Fi network as the TrickleStar Electric Water Heater Controller.If there is no Wi-Fi connection to the TrickleStar Electric Water Heater Controller, schedules that are stored prior to the disconnection will still be executed at the corresponding times. You can also switch on or off heating by using the power button on the TrickleStar Electric Water Heater Controller.