You have only 2 types. One is battery operated , found in most old houses.
烟雾感应器有两种，一种是使用干电池的，常见于大部分的老房子。
Listen to a battery-operated radio or television.
收听用电池的收音机或电视。
I got him one of those little battery-operated motorcycles.
我给了他一台那种装电池的小摩托车。
In case of power failures, keep a battery-operated radio handy (with extra batteries).
准备一个可以用电池的收音机(还有备用电池)以防断电。
In case of power failures, keep a battery-operated radio handy (with extra batteries).
准备一个可以用电池的收音机(还有备用电池)以防断电。
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