Blade BLH4100 120 S RTF +6-Channel Radio Sub-Micro Single Rotor RC Helicopter Fully assembled, no building necessary. SAFE technology makes helicopter flight more fun Panic recovery mode can prevent a crash. Flybarless rotor mechanical simplicity Durable construction with carbon-fiber components. High-speed coreless main and tail rotor motors (installed) Sub-micro linear long-throw cyclic servos (installed). E-flite 500mAh 1S 3.7V 25C Li-Po flight battery and charger (included) Multi-function transmitter with Spektrum DSMX technology. Refer to the PDF attached below in Technical Specification for User Manual