The Yamaha Survival Kit D2 (SKD2) contains everything you need to get the most from your Yamaha portable keyboard. This kit contains a power adaptor, a foot switch, headphones, and a DVD with plenty of learn to play software, digital owner's manuals and information on other Yamaha products. Plus, you also receive a two-year extended warranty and over $200 of rebate coupons on great Yamaha instruments and accessories. The Yamaha SKD2 works with Yamaha YPG-235, NPV60, NP30, and the NP31.