Meet the Amazfit tracker: a smart wearable device that can track your daily activity and sleep. It automatically tracks how long and well you sleep. The device has a smart module made from water-resistant zirconium oxide ceramic. It also comes with a silent vibrating alarm.
Amazfit weighs only 0.5 oz and has 10 days of battery life. You can wear it around your neck or wrist. Costs under $100 at this time.