lithelloum battery-powered:no external power supply,power supply stable and reliable quality.
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no external power supply
无外置电源
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The special feature of the demonstrator is that the sensing elements have no need of an external power supply.
这种演示装置的特点在于，其传感器件不需要外部电源。
youdao
Perfect for slipping into a laptop bag or pocket, all of Iomega's 2.5-inch portable hard drives are host powered, requiring no external power supply beyond the power provided through the USB bus on a personal computer, laptop or netbook.
ENGADGET: Iomega pushes ahead with USB 3.0 transition, promises to keep drives at USB 2.0 prices
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