This Fitbit Charge 4 Activity Tracker is perfect for both indoor and outdoor activities. It comes in small and large sizes and is sealed in black. This unisex fitness tracker is designed for iOS and Android operating systems and comes with a mobile app.

The Fitbit Charge 4 Activity Tracker has a GPS, heart rate monitor, water-resistant, and sleep tracker features. It also includes sensors such as an accelerometer, gyroscope, and radar. This fitness tracker is perfect for gym and training, yoga, running and jogging, walking, and crossfit. The Fitbit Charge 4 also provides a heart rate measurement and a 1-month manufacturer warranty.