A circular insulation sheath is arranged on the outer side of a plug. Annular interval space is arranged between the plug and the insulation sheath.
其插头的外侧有一个圆形绝缘护套，并插头与护套之间有一个环形间隔空间。
Insulation, heat insulation performance is good, according to different rate, the large space divided into a small space, in order to reduce air conditioning power consumption;
隔热节能：隔热性能优良，根据不同入座率，把大空间分割成小空间，以降低空调电耗；
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