Device notifications include text, email and Slack notifications and alerts for any device linked to your account, for example, set fermentation parameters for your digital hydrometer such as Tilt or send reminder to dry hop. Add your email and phone number in ‘My Account’ settings. https://www.brewersfriend.com/homebrew/profile/account Any 'Brew Log' with a future date or time can have notifications set.
Slack token - this is a webhook link to send notifications to your Slack account.