This little box has, inside it, some kind of circuitry that harvests WiFi energy out of the air and converts it into electricity. This has been done before, but the Airnergy is able to harvest electricity with a high enough efficiency to make it practically useful: on the CES floor, they were able to charge a BlackBerry from 30% to full in about 90 minutes, using nothing but ambient WiFi signals as a power source.

呢隻CHARGER 可以利用大氣中既wifi signal 轉化做電能為你既usb device 充電, 當然充電時間會好長 , 90 分鐘可以充到一部BlackBerry 既30% 電, 都幾搞野下

個人覺得實用性就唔高喇, 不過作為一件環保產品就十分有諗頭, 價錢亦都唔貴, 只係USD40, 有興起可以買返一舊黎型下比D friend睇