Fiturbo U3 Wired Activity Step Pedometer Plus Sleep Tracker, USB Data Sync & OLED Display, Green-Black Tracks steps, distance and calories burned Monitor how long and how well you sleep Syncs automatically to your computer or select smartphones and tablets via USB cable Li-ion Battery, rechargeable, short charging time for long use. Full charging time: 60min, Work Time: 5-7 days, Stand-by Time: 30-45 days (in a static position) Mini and exquisite design, extremely light and easy to take with, could be clipped onto your clothing