TFSeven&reg; Metal Waterproof Pocket Military Army Geology Compass Navigator with Foldable Metal Lid for Outdoor Activities Hiking Camping Climbing Biking With the special design of fluorescent light. You can use it and read data on it in dark environment after absorbing enough sunshine. Can be used for positioning, orienting on a map, plotting and so on. Suitable for motoring, boating, camping, mountaineering, exploring, hunting and other outdoor activities. With a bubble level, which can improve its accuracy and decrease its errors. Use high-strength metal matrix, rugged and lightweight, can withstand a variety of harsh environmental challenges.