The Walkman Blog: Sony Japan introduces the WH-XB900N, WH-XB700, WH-CH510 and WI-XB400

The Walkman Blog: 2019

The Walkman Blog: 2023

Sony WH-XB900N Wireless Noise Canceling Over-the-Ear Headphones - Black.WHTBOX (Renewed) : Electronics

Sony News and rumors

The Walkman Blog: Sony WI-XB400 and WH-CH510 Quietly introduced

The Walkman Blog: September 2019

Sony News and rumors

The Walkman Blog: Sony WI-XB400 and WH-CH510 Quietly introduced

Sony WH-XB900N Extra Bass Headphones review: A more affordable Sony noise-canceling headphone with extra bass - CNET