MyVolts 5V USB Power Cable Compatible with Grandstream GXP 2000 VoIP Phone This 5V high-quality power cable lets you power your Grandstream GXP 2000 from any USB port Package Includes - 1 metre 5V USB power supply cable, 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.