The Vivitar 283 was the first of many great units from Vivitar. It was so popular counterfeit units appeared in some parts of the world. Unit has been tested and is fully working . $25.00 The Vivitar 285 came out a few years after the success of the Vivitar 283. It featured adjustable flash coverage and variable or automatic flash output. $ 35.00 Please Text 250-880-3521