Just found a Galaxy 959 for sale for$75. Ummm, don't think I'll pass this up.....sellers sez still in box w/instrs & mic, sez it looks like its never been used. So, a coupla stupid ?s. Will a cobra style power plugwork with this unit, that way i could check it on my cars system.....and are there any telltale signs without breaking it open?? Im guessing that for that kind of $ I really cant go wrong.