What is the amp and voltage rating of the Nippon Labs power extension cord?

The Nippon Labs power extension cord has an amp rating of 30A and a voltage rating of 125V.

What is the maximum length this power extension cord can extend an existing power cord or outlet?

This power extension cord can extend the length of an existing power cord or outlet up to 25 feet for more flexibility.

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Nippon Labs L5-30P / L5-30R Heavy Duty Power Extension Cord, NEMA L5-30P to NEMA L5-30R, SJT, 10 AWG., 30A, 125V, Black 15 ft. Power Cable

Heavy duty NEMA L5-30P to L5-30R power extension cord is designed for large server applications that require higher-rated or heavier-gauge cabling.
Extend the length of an existing power cord or outlet up to 25ft for more flexibility.
The NEMA L5-30 locking connector allows it to be securely plugged into the power outlet for important equipment.
This heavy duty 10 AWG power cord is fully molded for durability.
UL and cUL listed.
All relevant materials are complied with RoHS directive.