The Celestron NexStar 90 SLT Computerised Telescope has the high quality 90mm Maksutov-Cassegrain optical design. It comes with a fully computerised Altazimuth mount and StarPointer finderscope, to help with alignment and accurately locating objects.
Powered by 8 AA (user supplied) batteries or an optional AC adapter (18778), the NexStar love to travel. The internal battery compartment provides power to the high precision servo motors for rigid low-vibration performance while eliminating cord wrap issues associated with external battery packs.
With the NexStar's ergonomically designed hand control, the user is free to remove the hand control from its holder for remote use or leave it cradled for hands-free operation. With a touch of a button, you can select the object catalog, change the slew speed, view fascinating information about an object or simply know if a desired object is visible in the sky.
Using Celestron's patented SkyAlign (patent pending), simply input the date, time and location into the hand control then slew the telescope to any three bright celestial objects in the sky. You do not need to know the names of the stars.
The NexStar 90 SLT has a quick-release fork arm mount, optical tube and accessory tray for quick no tool set up. There is a sturdy stainless steel tripod and accessory tray included.
The NexStar 90 SLT is good for terrestrial and celestial observing and includes the CD-ROM, The SkyX First Light Edition astronomy software which provides education about the sky and printable sky map.
For full specification see Celestron website: http://www.celestron.com/astronomy/celestron-nexstar-90slt.html