The Cook-key ® only needs a Wi-Fi connection for synchronizing. After that, the recipes are all stored on the Cook-key ® and can also be used offline. So, you don’t need a Wi-Fi connection to do any actual cooking.
You can either use the Cook-key ® via Wi-Fi or also via a hotspot on a mobile device – a smartphone or tablet, for example. Just make sure that the mobile device stays on during synchronization to maintain the connection. Please note that some mobile products go into sleep mode or energy-saving mode after being inactive for a short time and this can break the connection.
Incidentally, even though you can use mobile devices as a hotspot, you can’t use these products as a remote control for your Thermomix ® TM5 (SmartHome).