Fortitude Walkera HM 83# Nitro Helicopter with WK-0703 Transmitter -CCPM mixing control system and collective pitch structure make perfect 3D aerobatics like rolls, swoop, and inverted flights. -Metal rotor head, metal swashplate and metal tail fiber frame structure, built with legerity and novelty. The autorotation landing system, made of high quality one-way bearing, minimizes damage to your helicopter during unplanned landing. -Tail blades driven by belt provide easy adjustment, stable flight, and low noise. -15A fuel engine of high performance is powerful. -WK-0703 LCD transmitter with adjustable pitch (PIT) parameter, rudder mixing, throttle curve & servo exponential make flight more stably and precisely.