Fitbit Ace
Tech specs 
SizeOne size: Fits wrists 125mm - 161mm in circumference
Width 15 mm
MaterialThe Fitbit Ace wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. The Ace tracker and clasp are made with surgical-grade stainless steel.
Battery lifeUp to 5 days.
Water-resistanceRain, sweat and showerproof (IPX7)
Sensor3-axis accelerometer, vibration motor
DisplayOLED tap display.
Screen size
ColorsPower Purple/Stainless Steel; Electric Blue/Stainless Steel
Other- Saves 7 days of detailed motion data – minute by minute.
- Saves daily totals for past 30 days
Activity tracking 
SleepYes (light, deep & REM)
Heart rate
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
Running features
Swimming features
Smartphone notificationsCall, text and calendar notifications
Other - step challenges
- rewards and badges
- Fitbit App: Parent View
- Fitbit App: Kid View
Affiliate link*Fitbit
Read moreArticle
*Disclosure: We are a professional review site that receives a small commission from sales of certain items, but the price is the same for you. See our affiliate disclosure page for more details.
**All tech specs and images on this page come from manufacturers. These may change over time as manufacturers sometimes update their devices. While we cannot guarantee absolute accuracy of information on this page, we promise to review this content regularly and do our best to bring you the most up-to-date information. To be absolutely sure of tech specs of a particular device, we recommend checking the manufacturer’s website.