Activity Tracker for iOS and Android with Yellow Slim Strap,Tracks steps, exercise and overall calories burned.Get personalised guidance from Smart Coach.Log your meals and use UP App Food Score to know if you are eating right.LED display indicates progress toward your goals and time of day; Mix and match colours, straps and clips.Compatible with iOS and Android; Syncs wirelessly .Additional Information:Dimensions: 2.8 x 2.8 x 1 cm (tracker) + Adjustable strap: Standard Strap – 1.5 cm wide, fits wrist sizes 14.5-21.5 cm; Slim Strap – 1cm wide, fits wrist 15-19 cm.