Perfect for cars, campers, boats, pickups, RVs, ATVs, etc. Built-in compensators for extremely accurate readings. Dash or windshield installation. Self-adhesive mounting pads included. AutoDial with large directionals and numerals. Wide temperature range. Night lighting feature requires 12V power. Dial diameter: 1-7/8". Compass diameter: 2-7/8". Height: 2-3/16". Exclusive Manufacturer's 3-year factory warranty.