However, this is puzzling. Especially as the descriptions and the specifications are partly incorrect (both models are for right-handers and both have the same programmable buttons). The Swiss Logitech website only lists a G305 with the manufacturer number 910-005282, but not a 910-005283. I bought the G305 Lightspeed and it looks exactly like the G305 except for the G305 lettering on the bottom. The specifications of my G305 Lightspeed are identical to those of the G305 except for the information on the light sensor, which is stated at Digitec as "light-emitting diode" for the G305 and "laser" for the G305 Lightspeed. I assume that they are just different series of the same model.