This Sony DP-IF5000 Digital Surround Processor System has been tested and is in great working order. It requires a 9V power cord to function properly. The system offers an exceptional audio experience with its infrared wireless technology and stereo features. The headphones are wired and have a gray color which complements its sleek design. The system is manufactured in China and comes with no manufacturer warranty. This is a great addition to any audio enthusiast's collection.