 In conjunction with its "TI PLT-FHH1" Personal Learning Tool, Fido Hand Held and "TI PLT-SU1" Personal Learning Tool, second generation are prototype calculators.The project was eventually scrapped by TI in early 2004.However, a few of the early prototypes such as the PLT SHH1 leaked to the public, making it one of a few rare prototypes among collectors.