# "Silent Records" function?

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This feature is available in version 1.4 of B3 and version 1.2 of B4.
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Upon ex-works inspection, the silent recording function is activated,

* The device records the current time and temperature every 1 hour and saves them. The maximum recording time is 365 days, a total of 8,760 data sets;
* If the device is connected to the computer via USB before activation, it will generate a "Silent Records" report (CSV format), showing all stored temperature data and indicating that the report is a silent recording report;
* If a user successfully activates the device,  the Silent Records function will close, all saved data will be deleted. The device enters into a regular working state;

![](https://alidocs.oss-cn-zhangjiakou.aliyuncs.com/res/MNpQlKxmxzJNnDvL/img/52ba9265-afaa-4c36-9697-0208307e0700.png)

This feature is used as a backup feature for users who forget to turn on the device and guarantees the user experience.