I bought two flip clocks. One of them has a problem. The hours are flipping only when the minutes hits "30" instead of "00". I informed the seller Elong Co. Ltd on january 5. I received a reply on january 6 and seller informed me that he's gonna check this out but I had no follow up since, so it seems that I'm stuck with a defective flip clock.
This is second item I bought. Love this clock