Kenko Portable Equatorial Mount for Astronomical Photography Sky Memo S Standard Set Red Auto-guider interface:RJ12-12 6-pins(ST-4 Type) Power Source:4xAA battery(optional) Dimensions :173.5mm113.3mm96mm Weight: 1 kg Tripod mounting screw: 1/4'' to 3/8'' Convert Screw adapter Socket for 3/8'' Thread ScrewIlluminator:Built-in Polar Scope with illuminator for precise polar alignment.(Brightness adjustable)