LUMEN Metabolism Tracker is a handheld Metabolic Device for those on a Keto Diet. 

This device is used so this means it is subjected to wear due to regular use.

This wear is mostly external and does not hinder the device or its functionality. 

How it works. Take a breath. Anytime. In 20 seconds, Lumen reveals what your body is burning for energy: carbs or fats.

• Polymer battery with up to 10 days of charge (depending on daily usage