Review on EXCELFU Protector Adapter Analyzer Indicator by Kyle Ahmed

This device has very good indicators for diagnosing the correct connection of the plug, but I could not find anything in the documentation or in the device itself that would suggest how much overvoltage it could withstand or if it saw an overvoltage ( most network filters indicate whether they are good or not) or something like that. The instructions were in very poor English. Only the statement on the outside of the box 'said' that it is a surge protector. I wonder if someone mistranslated along the way and this is just a network analyzer.