I sent it back for them to try again, on its return it still did not function.
After telling them, and twelve months later, still no refund.
I then asked John Chandler, the manufacturer of Borealis Rain Lights if he could repair it.
He said he had no experience of repairing transponders, but was willing to try, within a short time he returned
it to me with a six day battery fitted.
I have used it at three race meetings and it works well ( the only complaint I have is that it does not record fast enough lap times

Well done John, and thank you very much.