Your Wave 2 can be used for basic warming and cooling without having the app; however, you do miss out on a great deal of functionality without it, including features like:
- Custom sessions that last for up to 60 minutes
- cooling only or warming only sessions
- LED adjustment (bright/dim/off)
The app also allows you to download firmware updates that do important things like improving battery life and making cooling/warming more powerful! For this reason, even if you don't plan to use the app regularly or don't have access to a smartphone, we strongly recommend installing it (or having a friend install it on their phone temporarily) so that you can get the most up-to-date firmware on your Wave and select your preferred mode. You won't be able to switch to other sessions without the app, but you will be able to warm and cool by just pushing either the dotted button or the blank button on the Wave itself.
To use the Wave without the app, either button to wake it up. Push the dotted button for cooling or the blank button for warming. The default mode that comes with the Wave is the 10-minute Essential session.