DIY power saver

有無人有興趣想整返個玩下
http://www.youtube.com/watch?v=pSWf9CdCQDY
http://www.youtube.com/watch?v=jA6CbIiKaZ0&feature=related
http://www.youtube.com/watch?v=0TlBOemCuWk&feature=related

沒有用的東西,DIY來做乜?

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香港好似係睇 True Power 嚟計電費,
所以如果個 PF 唔係太過唔正,
尤其係住宅,加咗都慳唔到$$$掛?

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