Control voltage is 24v/36v/48v, safety to workers; Brake:magnetic braking controller the special design to generate magnetic force, which allows instant brake as soon as the electric power is cut off.Thus the braking safety is guaranteed while loading. Limit switches to protect both lifting and dropping works to prevent from exceeding the limits; Special antiphase power protective device to control overfailure circuit of wrong power connection. The button pendant offers waterproof, light and durable switching control. Fec lifting chain from japan, high tensile alloy steel with heat treatment. Power:220v-660v, 50hz/60hz, 3 phase, dual voltage available. As customers' requirement