Intelligence：

1.Automatic off the pannel power when doors open, to protect workers safety.

2.4 contactors to make sure that all control voltage is lower than 38V. Safety first.

3.Phase-protector, to help protect the motor and electric parts is there has lack-phase or wrong-phase.

4.Limit Alarm, when the platform reach the highest height, alarm will rings heavily to remind workers.

5.Loading weight limit is optional parts here.