The Watford Co-Pro adapter box is made out of metal with a hinged lid for easy access to the insides. There is a 40-way ribbon cable for connecting to the Tube port, which is a little bit longer than the usual second processor cable. Watford Electronics appear to have solved the age-old problem of a ludicrously short cable being required.

There is an on-off switch and power LED. The adapter is mains powered so it doesn't draw any power from your Beeb.