Vocal card (Len) is an item that is used to purchase alternative vocals at the song store. Vocal cards are obtained through character rank milestones or by exchanging a vocal card exchange ticket.
Currently, the vocal card can be exchanged for alternate vocals featuring Kagamine Len in the following songs:
- Roki
- Doctor=Funk Beat
- STAGE OF SEKAI
- Ghost Rule
- Odore Orchestra
- Bug