✔ 最佳答案
As said, the "老鼠仔"(Cigarette lighter) is for lighting cigarette.
It is pluged into a 12-volt direct-current lighter socket, which is a standard equipment of every car. (12 volts in general but 6volts, 24 volts etc are installed in some brands).
Other than for use for charging the 老鼠仔", many 12-volt dc accessories can be connected to the socket, such as lights, tyre pump, mobile phone charger, fridge, cd/mp3/dvd players, and so on... For an example of products, please click:
http://www.outdoorgb.com/c/12_volt_electronics/
You can know more or buy similar products at the car accessories shops in mongkok or wan chai etc. Ask the shop staff for more inofrmation and knowledge.
If you want more information from the internet, please click:
http://hk.search.yahoo.com/search?ei=UTF-8&p=12+volt+adaptor&fr=FP-tab-web-t&meta=rst%3Dhk
希望可以幫到你.