I was looking for a mouse means format, M180 as I already own. I thought it, the reference number is higher, was a little bigger. Or the opposite: long 9cm against 10 for M180 In fact, he probably would have had me take the M185 or M187, which apparently have the same size as the M180. So a star less for information about the mouse specifications deficit (by the way, what does the cryptic phrase: "optical tracking Logitech Advanced Technology" ...) Otherwise, the mouse works perfectly, click a little noisier than the M180, but nothing insurmountable.
