Key Features Lightweight, molded-foam construction AS3X System providesoutstanding stability and smoother flight3-channel control for easy-flying andfriendly soaring characteristics Contoured spinner with folding propeller(installed)One-piece, removable wing with carbon fiber support-flite 8.5mm x23mm coreless brushed/geared (installed)Spektrum DSM2/DSMX 5-Ch UM AS3XReceiver/Servos/ESC unit (installed)E-flite 1S 3.7V 150mAh 25C Li-Po battery(included)E-flite USB Li-Po charger, 300mA (included)Included 1S Li-Po batteryprovides long flight times on a single charge Ideal for outdoors and largerindoor flying sites Needed To Complete- 4+ channel DSM2- or DSMX-compatibletransmitter Overview The E-flite UMX Radian is a powered sailplane that packsall the simple fun of the larger Park Zone Radian into a much smaller packagethat's an absolute delight to fly. AS3X technology gives a pilot the feelingof flying a much larger glider especially outdoors because of its renownedability to smooth out the effects of wind and turbulence. Its distinctivelycurved wing delivers outstanding lift and impressive glide ratio using3-channel control simplicity. The lightweight brushed power system requiresjust a single-cell Li-Po battery to provide excellent launch performance andlong flight times. Plus the one-piece wing can be easily removed and stored inthe handle-equipped box making your ability to soar through the clouds asconvenient as can be. You'll be in the air in no time thanks to great featureslike: Folding Propeller For maximum glide efficiency, the ESC is speciallyprogrammed to work with the folding propeller so it opens quickly and foldsback to streamline the airframe.