Eyeskey Multifunctional Military Army Aluminum Alloy Compass with Map Measurer Distance Calculator Great for Hiking, Camping, Motoring, Boating, Backpacking High strength engineering metal body, rugged and capable of working under extreme weather condition. Special design of fluorescent light, you can use it and read data on it in dark environment after absorbing enough sunshine. High accuracy, built-in a bubble level, which can improve its accuracy and decrease its errors. Waterproof and shakeproof, suitable for motoring, boating, camping, mountaineering, exploring, hunting and other outdoor activities. This Product is only Sold by Eyeskey Optics with EYESKEY LOGO on it. Other sellers listed their products on ours are selling the inferior products, which is infringement. If you don't notice it, you'll get the poor quality products.