New Fitbit Air details how it compares to Whoop — and how it actually works

The Google Fitbit Air screenless fitness band.

What you need to know

• Fitbit Air is much slimmer and lighter than Whoop while still promising up to a week of battery life.
• The tracker uses LED light patterns and double-tap gestures to show battery status and dismiss alarms.
• Fitbit Air costs $99 and pre-orders before May 25 also include a $35 Google Store credit.