Allytech Handheld Electronic Digital Compasses with Thermometer Clock LCD Display Mini Carabiner Clip Backlight Outdoor Travel For Sports Camping (Not including batteries) Altimeter mode: -2,296 ft - 29,500 ft range(relative height measurement, reference setting required) The electronic compass runs on a CR2032 battery, which ISN'T included in the package Product comes equipped with a built-in security clip, a compass, a thermometer, and a clock The electronic compass carabiner clip is ideal for hiking, mountain climbing, bike riding, as well as any other outdoor activity This product is great for attaching to your belt loop, work belt, or backpack, and fits nicely in any pocke. Light weight. mini size, with a clip. Easy to carry