To ensure the safety of the lashing cargo, buttons, parking: on-off agile and reliable, button labeled consistent with block movement. 2, limit action: reliable, correct, reliable safety correct operation of the Electric Hoist. 3, run: lifting gear reducer voice is normal, brake motor, reliable and flexible running car, safeguard electric hoist is normal and safety operation. 4, wire rope, must surround entanglement is normal, guide rope rope is reliable and stable rope, prevent the wire rope arrangement is abnormal or chaotic phenomenon lead to accidents. 5, hook: flexible pendulum turns (flexible roller rolling, hook should be horizontal scroll vertical swinging 180 ° 360 °, hook, let the work of the electric hoist is more flexible.)