Description Introducing iOptron iPolarTM - a high precision, easy to use electronics polarscope (e-PS). What makes iPolar unique?1. Can be easily installed inside the RA shaft on all iOptron equatorial mounts (except SmartEQ Pro).2. Can be used on any mounts with adapters either internally or externally. 3. USB plug and play (no driver needed)4. Works globally, no need to set northern and southern hemisphere.5. No visible Polaris (north) or Sigma Octantis (south) necessary.6. No need to rotate the mount during polar align. iPolar is a smart electronic polarscope for dummies.Sale price: iPolar only $248; iPolar with mounting accessory/adapter $268.Please select the correct mount from pull-down manual when ordering. Need help? Please check this iPolar Compatibility Chart. Features Fast and easy to use High precision (30 arcsec) No need to see the Pole Star No need to rotate the mount during alignment Unique imaging enhancement technique Smart plate solving On screen instruction during alignment Capable under poor sky visibility condition Compatible to most equatorial mount with a proper adapter Currently Supported Mounts: CEM120/CEM120EC/CEM120EC2 CEM60/CEM60EC CEM40/CEM40EC CEM25/CEM25EC/ZEQ25 iEQ45Pro/iEQ45 iEQ30Pro/iEQ30 SkyGuider Pro SkyGuider SkyTracker Pro SkyTracker Specifications Field of View (FOV) ~ 13 degree Resolution 30 arcsec approx. Alignment Precision 30 arcsec Interface Mini USB2.0 Software iPolar Software Operation System Windows Vista/ 7 /8 /8.1 /10, 32bit or 64 bit Warranty One year limited