The Black Watch was equipped with a red
light emitting diode display, which illuminated only when the watchcase's surface was pressed; pressing one part of the case displayed hours and minutes, pressing another displayed minutes and seconds. The Black Watch was later available in grey and white, with these versions also having a date function. The product was beset by technical problems, including short battery life, variable accuracy and a very sensitive
integrated circuit which could be rendered useless by static shock. In spite of this, Sinclair's advertising still claimed: :
If that sounds technical, think of the outcome: a watch with no moving parts, a watch with nothing to go wrong, a watch which gives accuracy never achievable by the most precise mechanical engineering. ==Reception==