Casio LWS2200H 8 Step Tracker Digital Watch brand@Olivia Burton it runs on light and it runs on light and doesn't require battery changes Vibration resistant) • Sapphire Glass with non reflective coating • Screw Lock Crown • 200 meter water resistance • LED light (Super Illuminator) o Afterglow • Tough Solar (Solar powered) • Time calibration signal reception • Time Calibration Signals • Mobile link (Wireless linking using Bluetooth®) • The auto hand home position correction • World time 39 time zones* • Stopwatch • Countdown timer • Daily alarm • Battery level indicator • Power Saving (hands stop to save power when the watch is left in the dark) • Full auto calendar (to year 2099) • Date display • Size of case : 55 999 step count display range Step count history display: Daily data (8 days) Step goal progress display (step count goal setting range: 1