... V, dc voltage, working voltage 220 V circuit control system. It is suitable for outdoor area, the ... and dusty environment infringement,such as the remote control of the electric hoist crane, the equipment and so ... for:-5 degrees to + 40 degrees, 24 hours of their average not more than + 35 degreesb, the ... temperature for + 40 degrees, air relative humidity of no more than 50%, and under the low ...