Fitbit Alta Activity and Sleep Wristband - Large

All Day Activity - Tracks steps, distance, calories burned and active minutes, SmartTrack - Automatically recognizes select activities and records it in Fitbit app, auto sleep tracking and silent alarm, monitors sleep and provides silent alarm capability. Reminders to move - receive reminders to move and encourages 250 steps per hour, smart notifications - see when you receive calls, texts and calendar alerts with Bluetooth 4.0, Fits wrists 6.7"-8.1" in circumference.