Seraph Rear View Mirror

On my recently purchased 2000 Silver Seraph, there are some indicators in the glass of the interior rear view mirror. There is nothing about them in the owner’s manual and the sales people at the authorized dealership could not tell me what they are for. Can someone tell me what the digital display and the arrows are for?

Thank you,
Joe

Thanks anyway, but I found the answer. It's a dealer installed Radar unit.