I just bought a black WMO which I thought was 1.1a but mine doesn't say that. It says Wheel mouse optical USB and ps/2 compatible. I'm assuming that this is the very old version. I couldn't find any pictures of black WMOs where back says 1.1a. So I'm assuming that the blacks one are the old one with default 400 DPI. The mouse that Rapha uses is also a black WMO. Anyone know if that's the old WMO or 1.1a?