The Lost Driver (ロストドライバー) is the transformation belt, which is shown used by Kamen Riders Skull, Eternal, and Joker. It is a Second Generation Memory Driver and its design is the same as the Double Driver except it has only one Memory Slot to insert a Gaia Memory.
This release is the ver. 20th edition of the Lost Driver – a rereleased edition of the original DX toy to commemorate the end of the Heisei Kamen Rider period. This edition is bundled with the Eternal and Skull Gaia Memories.