up until a few weeks ago it worked without problems, among other things the operation is simple: insert a 9v battery into the appropriate compartment and press the side button to turn it on and have the green phosphor night vision. For some days, I don't know why, it doesn't work anymore and it lights up but there is a flashing of the green phosphors, in flashes, as if it were a false contact.

I don't know what it is or if it is repairable or not and it is clear that it is sold as DEFECTIVE and TO BE REVISED or FOR SPARE PARTS