The Sony Wireless Headphones WH-RF400R with Transmitter Dock TMR-RF400 are black, on-ear headphones with an adjustable headband and volume control. They are wireless with RF technology, have a 6ft cable length, and come with a rechargeable battery. These headphones are designed for personal use and are manufactured in Vietnam. They do not have a built-in microphone or personalization options.

Had rechargeable batteries inside. Dead

Used 2 aaa and power came on and lights green

No way to test sound other than noise in headphones that you hear with them on. Humming

As is.