The ultimate companion for the avid hiker, the TrekGuide from Celestron features a digital compass, built-in altimeter, barometer, weather forecast, and more. The Celestron Trek Guide lets you be as adventurous as you please without getting lost. The TrekGuide features a digital compass, image built-in altimeter, barometer, weather forecast, and a whole lot more. The ultimate companion for the avid hiker, the Trek Guide is a simple, durable compass device that keeps you going in the right direction, even when the path is not visible! This hiking gps is the perfect companion for trekking through the outdoors. Hiking compass devices are built for exceptionally accurate readings to help you keep your bearings. Never get lost in the woods again thanks to the Trek Guide. Features Digital Compass with headings and degrees Altitude in both feet and meters Barometer shows barometric air pressure and sea pressure Weather Forecast using icons Temperature (F or C) Current Time Calendar showing day, month and year Alarm Bubble Level Backlight LED for use in low light conditions Lanyard Batteries Included Water Resistant Specifications Temperature measuring range -20° to +60° C and -4° to +140° F Altitude measuring range -400 to 9000 meters and -1312 to 29,528 feet Barometer measuring range 900 to 1100 mbar/hPa, 675 to 825 mmHG, and 26.58 to 32.48 inHG Power Supply Battery CR2032 lithium x 2 pcs Dimensions L x H x W Weight 70 g or 2.5 oz Available in black and Orange