The Fitbit Charge 2 FB407 is a black plastic activity tracker designed for both indoor and outdoor use. It provides heart rate measurement and language options in English. The device is compatible with Android operating systems and has a 1.5-inch display size. With an accelerometer sensor, this unisex adult Fitbit model is ideal for gym training and running activities. The package includes the Charger 2, making it a working and reliable fitness technology tool for tracking your health and wellness goals.