The Kestrel meter is the must have device for precision and long range shooters. If you have been looking for an all in one weather meter, wind analyzer and predictive ballistic application your search is over. The Kestrel 5500 provides you with more functionality and improved environmental features over previous models. This particular model includes Bluetooth Link which allows you to connect to PC's/Mac's via a dongle or to a smartphone android or IOS device. Additionally this unit includes the vane mount. Specifications and Features: Kestrel 5500 Electronic Hand Held Weather Meter 0855LVOLV Digital Compass Wind Direction Crosswind Headwind / Tailwind Ballistic Applications Weather Meter New Features for the 5500 Series Bluetooth Link works with PC/MAC via Dongle Bluetooth Link works with smartphone Mobiel / Android / IOS Battery Door IN Back Improved High Resolution Screen for Any Lighting Condition Intuitive User Interface Screen Navigation Multiple Languages; English, French, German and Spanish Scratch and Breakage Resistant Window All Meters include both options of Red (NV - Night Vision) and White Backlights Slightly Bigger No real noticeable difference; fits same cases Roughly 12,000 data points Runs on one AA Battery Olive Drab Green Finish Includes: Neck Lanyard AA Lithium Battery (Average Life 400 Hours) Protective Drawstring Pouch Certificate of Conformity (with complete specifications) Instruction Manual Five Year Warranty Zipper carry pouch holding meter with Vane Mount