Report: Don’t offer certified report, But All Of my items are tested before i get it from factory, you also can retest when you get it. The quality must be guaranteed. Comment: We sell is quality. Customer is Number one Important. Welcome to give any advice, we will do best. Please don’t leave negative or neutral feedback, if any problem with my product. We fully guarantee our items. All items are in brand new condition unless specified otherwise elsewhere in the description. (not include Public holiday). (2)Work Hours: 9:00 a. To 6:30 p. (GMT+8)of Monday to Saturday. And our office is closed on Sunday and public holidays. We apologize for the late reply during the holidays.