Name: CompassHousing: Titanium Alloy/BrassInner shell: polycarbonateSize: 22mm * 8mmWeight: 17.6 grams of brass, 9.5 grams of titanium alloyCarrying method: hanging buckleIt can also be used for anti-magnetic bearings and internal vacuum packaging in low light environments. The positioning is accurate and fast, and it can still work in high or low temperature environments.prevention:Please use it whenever possible to improve accuracy. To avoid confusion with magnetic needles, please keep a certain distance from magnetic objects (such as high-voltage lines, generators, speakers, magnets, etc.) during use.It is very suitable for camping, clim, hiking and traveling.