I have had this for a long time. It may not have been a HWS 558, but it looks identical to it; except the way it mounts. as you can see from the picts, mine is a screw where the new model is a clamp(?) on style. Mine also has flip up covers for both lens, and I can't find those today. Takes 2 AA batteries. Excellent condition. Just a trace of battery wash in battery compartment. They are now $675. ! I would like to get $500. and I'll pay shpg.