Many fitness trackers on the market will keep track of your pulse, but the 'Lief' is also able to sense your heart rate variability in order to help identify when you're stressing out.
Instead of simply tracking how long your heart rate is elevated for or how long you're feeling stressed, the 'Lief' takes evasive action by guiding a user to steady themselves. This comes in the form of haptic feedback that will help to guide users to steady their breathing and focus more on relaxing themselves.
The 'Lief' is purported by the creators of the device to help improve heart rate variability by about 140% on average, which makes the device a true marvel for those in high-stress jobs or situations on a daily basis.
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