Operation confirmed. Yamaha PAS Lithium S 2010 Model Model Number: X651 Model: PZ26LS Serial Number: X541 Key Set: X37-8A8J0-20 -21 Manufacturer's Suggested Retail Price: ¥12,100 (tax included) One key included. Although it is a Bridgestone key, it is compatible with Yamaha and can be used. Key Number: D9013 If you have any questions, please inquire in the comment section. Due to shipping, the spring protrusions will be secured with tape. Please understand this in advance. We have wiped it down before listing, but please understand that there may be minor dirt in grooves, etc., as it is a used item. Thank you for your understanding.