Manufactured and sold by Apple, the PowerBook Duo was a line of small subnotebooks that were more compact than the PowerBook Line. Launched in 1992, the new range of devices was available till 1997 in seven different models, namely the Duo 210, 230, 250, 270c, 280, 280c, and 2300c. The PowerBook Duo was the lightest, weighing only 1.85kgs and also the slimmest PowerBook of its time. Even though the specifications were great, the device had a few drawbacks. The Duo used 88% of the standard keyboard that made it difficult to type on. Likewise, the size of the trackball too was reduced adding to the inconvenience.