Bullseye's Sigth-In AmmoCam system generates its own WI-FI hotspot so you don't need Internet or cellular service. It has a 300 Yard Range (with clear line of sight), measures groups, calculates sight-in adjustments, marks shots, and color sorts. Multiple users can shoot the same target, and view it at the same time which makes this AmmoCam ideal for training and teaching. It is also compatible with the free Bullseye Target Manager software package for iPhone, iPad, Android devices, windows XP, Vista, Windows 7 and Windows 8. Included is a rechargeable lithium-ion battery pack with charger (12 hour run time). This camera's exterior dimensions are 14" x 8" x 10".