The Kestrel 5700 Elite Weather Meter with Applied Ballistics is an all in one weather meter with the ability to log primary environmental conditions such as wind speed, direction, temperature, humidity, heat index, pressure, and altitude. This meter come integrated with the Applied Ballistics bullet library of custom drag models, your bullet's drag profile with corrections for Aerodynamic Jump, Spin Drift, Coriolis, and Drop Scale Factoring to achieve accurate extended long-range shots.Features Bluetooth LINK to Smartphones / Mobiel / Android / IOS; Takes 1 AA battery (instead of 2 AAA); Battery door is in the back, sealed away from the motherboard, should your battery leak.; Improved high resolution screen; Intuitive user-interface screen navigation; Multiple Languages: English, French, German, Spanish; Scratch and breakage-resistant window; All meters include both options of Red (NV - Night Vision) & White backlights.; Slightly bigger, not really noticeable difference. Fits same cases.;