The Vixen 35505 Polarie Star Tracker is designed for Astrophotography. This compact mount platform allows you to capture nightscapes and star images with ease. The Polarie attaches to a standard camera tripod and can accept any digital camera weighing up to 3.5lbs. Using the included compass on the Polarie, orient the mount to face north.The Polarie features a North Star alignment window that you point at Polaris. The Polarie can also use a polar scope for alignment. Once set, the Polarie tracks with the motion of the stars to eliminate 'star trailing' on your images resulting in sharp images of the Universe. The Polarie uses very accurate stepping motors and operates on 2 'AA' batteries.Polarie is designed to not only be functional, but also to be compact and attractive. The Polarie has a smooth, good looking design. The unit has no visible screws and although, not waterproof, it is designed to function in most weather conditions.Specifications:- Payload Capacity: 3.2 kg- Power Source: 2 x AA batteriesDC2.43.0 V, Optional external power supplyDC4.45.25 V- Runtime: ~4 hours at 68F/20C with a 3.3 lb / 1.5 kg load using alkaline batteries- Dimensions: 137 mm x 95 mm x 58 mm- Weight: 635.0 g without batteriesIn the Box:Vixen Optics Polarie Star TrackerModel: VX35505