Looking very like the Big Mack switch (S39), this switch is a reward switch for use with any of our switch adapted toys and equipment. The 13cm wide activation area is really sensitive and is perfect for someone with visual or motor skills impairments. There's also a useful feedback click when the switch is pressed. Unlike the Big Mack switch, this is not a communication aid. There are in fact four interchangeable brightly coloured tops, which you twist into place. There's also a clear plastic cover, under which you could place a picture or symbol.