Amazon Halo Band Activity Tracker - Black/Onyx, Small Brand New, Factory Sealed Amazon Halo introduces a brand new way to measure, track, and improve your health every day. Comfortable, secure, and swim-proof, the Halo band is ready to move with you. Halo measures intensity and duration of your activity through the day, tracks the quality and quantity of your sleep, helps you measure body composition, and more. MembershipMembership includes body composition, tone of voice analysis, sleep & activity tracking, and more — free for 6 months. Auto-renews at $3.99/month + tax. Contact Customer Service to cancel.No ScreenScreen-free for fewer distractions.Body Composition (Optional Feature)Measure body fat percentage, a better indicator of health than weight or BMI alone.SleepAnalyze patterns like how often you wake up during the night.DiscoverHundreds of premium on-demand workouts, daily meditations, sleep and nutrition support, and more.Tone (Optional Feature)Analyze qualities of your voice like energy and positivity to help strengthen communication.