FITBIT Hi-tech Accessories. FITBIT CHARGE FITBIT monitors your heart rate directly from your wrist without the need to wear a chest strap. Optimizes your workout by keeping you at the desired training level. With up to 7 days' battery life, it allows you to monitor all-day activity: steps, distance, calories burned, floors climbed and active minutes; it will also monitor your sleep quality, display incoming calls and wirelessly sync your statistics to a computer and over 120 types of smartphone. Plastic