Notion only has one power button. To turn Notion on, press and hold the power button for two (2) seconds. To turn Notion off, press and hold the power button for two (2) seconds for a safe shut down, which will occur about 30 seconds later. To perform a hard shut down, hold the power button for five (5) seconds. It's recommended to perform safe shutdowns instead of hard shutdowns.
If you wish to charge your Notion, we recommend powering down Notion and plugging it into the included USB cable. Notion will automatically enter sleep mode while charging, where no brainwave data is read in. Notion indicates sleep mode via flashing it's LED status light.
If Notion overheats, it will shut off. Give Notion 10-15 minutes to cool down and then turn it back on.