MyVolts 9V USB Power Cable Compatible with M-Audio Keystation Pro 88 Keyboard This 9V high-quality power cable lets you power your M-Audio Keystation Pro 88 from any USB port Package Includes - USB 9V power supply adaptor, Lifetime warranty - this power supply comes with a warranty covering up to the lifetime of your device, or 10 years - whichever is greater.Energy efficient - this power supply is Energy Star level 5 approved, guaranteeing more efficient delivery of power to your devices, at less cost to you.