3 Channel radio controlled 1.Fly it forward; backward; turn left & right 2. Proportional system enables it to move up & down and stay at any height.  3. Co-axial structure enables it to fly stably indoors and outdoor.  4.All spare parts are replaceable.  5.Servo & transmitter upgraded available to be MODEL HELICOPTER Frequency 27MHz 35MHz 40MHz 49MHz Packing Info  Box Size:36x11. 5x17. 5 cm Carton Size: 48x45.5x55 cm Pcs / Ctn: 6 pcs G. W. / N. W. : 9 / 7. 2 kgs