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The built-in storage battery of the office platooninset can supply for you computer in a short period of time,so the data in your computer would not lost because of a power failure .And the strong sparking of the LED （ps：In a normal working state ,the LED is on ）and the sound of the loudspeaker will prompt you to keep the data in the computer when the power shut down .In adding ,press the botton to stop the strong sparking of the LED and the sound of the loundspeaker.