Your smartphone can do a lot these days, but it can’t do it all. And even when you’ve got apps for seemingly everything, they won’t do you much good when your phone battery dies. That’s when a solar-powered, cold-resistant watch like the Pro Trek PRG-650-1ER really comes in handy.

With a digital compass, altimeter, barometer and thermometer all built in, this watch packs a suite of useful tools into a compact housing, making it an optimal companion for your next mountain adventure. You can measure your uphill progress with the height gain tracker and save up to 40 different sets of altimeter data in the watch’s data memory. Resistant to cold down to -10ºC, it’ll keep on ticking through the toughest conditions, and 10 bar water resistance means that once you get off the mountain, you can take your watch into the hot tub with you.

Learn more at protrek.eu.

We’re giving away a Casio Pro Trek PRG-650-1ER on our Instagram this weekend! Check out @downdays_eu for your chance to win.