The Fitbit Charge 6 Activity Tracker in Obsidian/Black is a sleek and versatile device suitable for both indoor and outdoor activities. Made from durable aluminium, this activity tracker is designed to be worn on the wrist and features a range of sensors including an accelerometer, GPS, and compass. With its heart rate monitor and sleep tracker capabilities, the Charge 6 is ideal for individuals looking to track their fitness progress in detail. Compatible with iOS and Android operating systems, this Fitbit model is suitable for both men and women who are into gym training and running.