The Psion 7 - hereafter called the Seven - was a subnotebook made by the company behind the Series 3, 5, Revo and netBook PDAs. Based on solid-state technology, the Seven was instant-on, silent, lightweight and had a battery life of more than 8 hours. There are still a number of active users of these machines, but after Psion Inc pulled out of the mass-market hardware business, the number is decreasing every year.