With the Celestron StarSense Explorer DX 102AZ Smartphone App-Enabled Refractor Telescope locating objects has never been easier, faster, or more accurate. Within minutes of setting up the telescope, you can be navigating the sky with confidence. Place your phone in the unique StarSense dock and launch the StarSense Explorer app. After aligning your phone to the telescope's optics (a quick, 2-minute procedure), the StarSense Explorer generates a list of celestial objects currently visible. Make your selection and arrows appear onscreen, guiding you as you to move the telescope. When the object is ready to view, the bullseye turns green. The StarSense Explorer works with most modern smartphones, including iPhone 6 and up and most devices running Android 7.1.2 or later manufactured since 2016. StarSense Explorer uses patent-pending technology and your smartphone to determine exactly where the telescope is pointed in the night sky. A Lost in Space Algorithm (LISA), like the ones satellites use in orbit to correctly reorient themselves, helps the app match star patterns it detects overhead to its internal database. An ultra-stable altazimuth mount provides a sturdy foundation for StarSense Explorer DX. Slip clutches and geared slow motion controls in both axes help you move the telescope smoothly and zero in your target. As celestial objects appear to drift across the night sky, you’ll be able to follow them with just a turn of the knobs. It’s all anchored by an adjustable, full-height tripod. With a large 102mm objective lens, this telescope has enough light gathering ability to bring out detail in celestial objects. You can expect sharp, bright views of Jupiter's four Galilean moons, its cloud bands and Great Red Spot, the rings of Saturn, the trapezium in the Orion Nebula, and beautiful Pleaides Open Star Cluster. Celestron's XLT optical coatings improve light transmission, enhancing the views even more. The telescope also includes a 90-degree erect image diagonal, so you can use it during the day to view birds, wildlife, landscapes, and more. Even if you live in a light polluted city location, StarSense Explorer is advanced enough to be able to pick out Jupiter, Saturn, Venus, the Orion Nebula, double stars, and a few more of the most famous celestial objects. But if you can take the telescope to an even slightly darker location, more objects will become visible. With this 4" Refractor and relatively dark skies, the Andromeda Galaxy, Hercules Open Star Cluster, and so many more are easily within your reach. The entire telescope kit weighs just 14.2 pounds, so it's perfectly portable and easy to bring on your next camping trip or to a remote observing site. Features - 102mm Refractor optical tube - StarSense dock for your smartphone - Low powered (25mm) and high powered (10mm) eyepiece - 90-degree erect image diagonal - StarPointer red dot finderscope, perfect for using the telescope during the day or without the StarSense Explorer app - Altazimuth mount with slow motion controls - Full-height tripod with an accessory tray to keep you organised Specifications Optical Design: Refractor Aperture: 102mm Focal Length: 660mm Focal Ratio: f/6.5 Focal Length of Eyepiece 1: 25mm Magnification of Eyepiece 1: 26x Focal Length of Eyepiece 2: 10mm Magnification of Eyepiece 2: 66x Barlow Lens: None Finderscope: StarPointer red dot finderscope Optical Tube: Aluminium Highest Useful Magnification: 240x Lowest Useful Magnification: 15x Limiting Stellar Magnitude: 12.5 Resolution (Rayleigh): 1.37 arc seconds Resolution (Dawes): 1.14 arc seconds Light Gathering Power (Compared to human eye): 212x Optical Coatings: Fully XLT Coated glass optics Optical Tube Length: 812.8mm (32") Optical Tube Diameter: 118mm (4.64") Mount Type: Manual Alt-Azimuth Height adjustment range (includes mount and tripod): Aluminum, 1244.6mm (49") max height Tripod Leg Diameter: N/A Accessory Tray: Yes Slew Speeds: Manual GPS: Uses phone's GPS Dovetail Compatibility: CG-5 Dovetail bar Power Requirements: None (Recommend PowerTank Glow to keep phone charged while using app) Alignment Procedures: Use StarSense Explorer app Software: StarSense Explorer app | SkyPortal app | Celestron Starry Night Basic Edition Software Total Kit Weight: 14.2 lbs (6.44 kg)