You turn on the Matrix and Street with a short press on the power button. The power button can be found on the left strap of your helmet. You should hear (and feel) a click when you press that power button. You turn it off by holding the power button.
Here's a video showing the same, as well as how to toggle through the different patterns.
When the battery on the helmet is critically low and is about to shut off before it does so the helmet will beep several times to inform you that it is about to shut off.
If you wish can set the battery notification in the app so you get notified on your smartphone when power is low or when you turn on/off your helmet.
It doesn’t power on?
- Try using your index finger and/or a different angle to press the power button.
- Make sure your Matrix or Street is charged.
You can read this article on how you can charge your helmet and remote.
Note: If you turn on your helmet by holding the power button, it enters into Pairing Mode. This means you can pair your helmet with a new phone or remote. If you've already paired it with your phone and remote, do not turn on your helmet in pairing mode.