Go bold. Explore the great outdoors! Get the PRO TREK PRG-601 featuring materials expected to reduce environmental impact and big bold index numbers.The digital compass, barometer/altimeter, and thermometer Triple Sensor helps you stay on top of changes in the natural environment, while Tough Solar converts light into the energy needed to power the watch. TECHNOLOGY & FEATURES: World time Stopwatch Alarm/hourly time signal Timer Alarm/hourly time signal Double LED light Full auto-calendar (to year 2099) The auto hand home position correction Battery level indicator Accuracy: 15 seconds per month Button operation tone on/off Power Saving (display goes blank and hands stop to save power when the watch is left in the dark) Run time: 7 months on rechargeable battery (operation period with normal use without exposure to light after charge) Run time:25 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)