至少25英尺长的加强型外接电源线。

At least 25 'heavy duty power extension cord.

youdao

内置后配电池，保证无外接电源时，时间可常运转。

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

youdao

内置后配电池，保证无外接电源时，时间可常运转。

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

youdao