Control your telescope wirelessly from your iOS or Android smartphone or tablet with the free Celestron mobile app with planetarium interface and SkyAlign technology Compact, portable Schmidt Cassegrain telescope with StarBright XLT optical coatings and Fastar compatibility Computerized GoTo mount with high-performance worm gears and motors for improved tracking accuracy, along with reduced gear backlash Rechargeable lithium-ion battery with enough power for 10 hours of continuous observing Improved industrial design with manual clutches and integrated carry handles, plus the added convenience of two accessory trays and a USB charge port for your smart device