The first commercially sold portable was the IBM 5100, introduced 1975. The next major portables were Osborne's CP/M-based Osborne 1 (1981) and Compaq's 100% IBM PC compatible Compaq Portable (1983). These "luggable" computers lacked the next technological development, not requiring an external power source; that feature was introduced by the laptop. Laptops were followed by lighter models, so that in the 2000s mobile devices and by 2007 smartphones made the term almost meaningless. The 2010s introduced wearable computers such as smartwatches.