Robbe arrow plus trainer black bullet single rotor helicopter rtf ftr 2 4ghz robbe 1 s2538 a factory assembled ready to fly 2 4ghz single rotor helicopter that is a high quality aircraft especially suitable for new pilots the remote control features an lcd display that provides full status indication the sensitivity of the control inputs can be adjusted between reduced and expanded so that beginners will find it easier to make more precise adjustments robbe electr single rotor helicopter