Fitbit ZIP Wireless Activity Tracker

Tracks steps, distance and calories burned
Syncs automatically to your computer or select Bluetooth 4.0 smartphones or tablets
Set goals, view progress, and earn badges
Share and compete with friends throughout the day
Free iPhone and Android App
Small and discreet - wear in pocket, on belt or bra
Log food, weight and more on Fitbit's website or apps
Sweat, rain, and splash proof
Replaceable battery with a 4-6-month life