HQRP AC Adapter / Power Supply for Yamaha Piaggero NP-11 / NP11 / NP-31 / NP31 Keyboards Replacement + HQRP Euro Plug Adapter - Walmart.com
Amazon.com: PK Power 12V AC/DC Adapter for Yamaha PIAGGERO NP31 NP11 NP30 NP 31 NP 11 NP 30 Portable Grand Digital Piano Keyboard 12VDC Power Supply Cord Cable PS Wall Home Charger :
Yamaha NP31 76-Key Portable Digital Piano with Yamaha D2 Survival Kit, Bench, Stand, & Headphones | Musician's Friend