... :5m 1) Convenient operation 2)Take electricity convenien 3)Job security 4)Environmental clean 5)PortableAdvantages of product(1)"New ... service life of the machine(4) "New" motors - with independent intellectual property rights of core technology, strong high quality motor, torque is ... can be used, line length about 450 meters.(3) Job security: electric jack has lift the self-locking protection device ...