FitBit Zip Wireless Activity Tracker - Charcoal Gray Clip-on tracker, tracks steps taken, calories burned and distance travelled Rain, splash and sweat-proof Runs off a replaceable watch battery (included) - lasts approx 6 months Syncs wirelessly and automatically with PCs, Macs, lots of iOS devices and some Android phones Perfect gift or present for your Dad Auntie Uncle Niece Nephew Brother Sister Boyfriend Husband Wife Teenagers