Check the listing for details. Yamaha PS-55S Keyboard Tested Fully Functional! Has The Defect See Pictures. Condition: Used. Listed at 175.00 USD. The Yamaha PS-55S Keyboard is a fully functional 88 key keyboard synthesizer with a model number of PS-55S. Despite having a defect, this keyboard is still a reliable choice for musicians looking for a high-quality Yamaha keyboard. The images provided in the listing will give a clear idea of the condition of the keyboard, making it easy for buyers to make an informed decision. Built by Yamaha, a trusted brand in the musical instruments industry, this keyboard offers a wide range of sounds and features for creating music. No case good used condition. One key is broken. See pictures. Some knobs are missing but are still functional. See all pictures. Fast shipping. None of the defects affect the pliability of the instrument