One of Sinclair's last audio products, the Project 80 was an updated version of the highly successful Project 60 released three years earlier. It brought the earlier design up to date with a black anodised aluminium fascia and sliders rather than knobs (although the sliders, people soon found, caused ear-splitting crackles when the dust got into them). The power amplifier had been slightly uprated. The big feature of the Project 80, however, was its "non-obtrusiveness" - it could be built into a book end or the base of a lampshade (see right), amongst other somewhat unusual ideas.