Contains everything you need to make using your Yamaha portable keyboard just that much more enjoyable. Every box contains a power adaptor, a foot switch (except for SKC - not required), headphones, and a DVD with tons 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. Works with YPG535/635 and DGX-640 88 Key Portable Grands.