salesman说只要把这省电器插在家里的任何一个插座上,开上电源,就可以省下30-40%的电费(尤其是当我们开着冷气或耗电量大的电器时)
salesman还说如果没有效果,可以退钱。
请问有用过的人,这真的可以省电吗?
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