If so, this is a good news for you.
This pass is a free ticket between Ito station and Izukyu-Shimoda station for one day, and you can board and get off any local train or non-reserved seat of Limited express train at any station without a limit.
Train ticket between Ito station and Izukyu-Shimoda station is 1,600 yen, but this pass is 1,000 yen.
If you are JR Pass holder, you should buy this pass at the fare adjustment office of Izukyu-Shimoda station.
Please show your passport, issued by government except Japan, to buy this pass at the ticket counter.