It is difficult to say when the very first TV accessory was invented or when it hit the consumer market.
The first TV accessory with which owners could actively influence the content displayed on the screen in real time was the Magnavox Odyssey, the first commercial home video game console, released in September 1972 by Magnavox for a list price of $99.95.
One of the first TV accessories that could record TV programs available for consumers was the Clie Pega-VR100K by Sony, released on October 9, 2003, for a list price of $479.99.
As of 2017, TV accessories are a rapidly growing market which is expected to grow even more rapidly in the near future. Some of the most popular manufacturers of TV accessories include Sony, Magnavox, Apple, Nvidia, Amazon, Samsung, Google as well as many independent third-party suppliers