Work without external power, energy saving.

工作时不需外界动力，节省能源。

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Without external power source, Internal battery can ensure the time displays normally.

内置后配电池，保证无外接电源时，时间可常运转。

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On a full charge, the Model 7500 can operate from four to six hours without external power.

若充饱了电，「模组7500」可以在没有外接电源的情况下，连续使用约四至六个小时。

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Stations should be able to run for a minimum of 48hrs without external power.

UNESCO: Social and Human Sciences

The Zenros Solar Touch panels can be installed without the use of any new cables or external power and retrofitted to any hotel.

FORBES: Solar Powered Energy Management for Hotels

Utility Con Edison noted over 3, 600 customers were without electrical power, and announced they secured over 700 external contractors in order to try to keep its services running.

FORBES: Crane Dangling Dangerously At New York Luxury Highrise One57 As Hurricane Sandy Intensifies