I got one a month or so ago....it didn't work....counted down the time but no ring at the end. Paid to send it back, they were out, got a refund.
Reordered when they were back in stock....got it Friday...same thing, no ring at the end

I am just keeping it to look at, I guess. I don't want to pay the postage to send it back again.
Guess a note to them is in order.