1. Structural pieces with 690MPa high-strength steel plate welding, high strength, good toughness, light weight. 2. The use of advanced three-dimensional design and stress analysis to ensure product reliability. 3. Rotary mechanism using hydraulic mechanical double brake, to ensure the operation and driving safety. 4. Winning mechanism using mature hydraulic winch structure of small noise, high efficiency, good reliability. 5. Suspension and contraction of the three-stage cylinder + cable with telescopic form, with the ability to carry the leading domestic, cylinder part of the 100%, rigging part of 2 / 6. Work range, wide range of applications. Products with car seat control, operation field of vision better, more secure operation.