Entrepreneur Min-Liang Tan made a computer mouse especially for gamers and thought that would be all his company would sell.

Back in 2005, he founded gaming hardware business Razer with Robert Krakoff and launched the Diamondback mouse, testing it out on his friends.

Fast-forward to 2018 and the company still makes mice, but has added gaming keyboards, headsets and laptops and has more than 40 million users on its software platform. It made $517.9 million in revenue in 2017 and listed on the Hong Kong stock exchange in November, raising $528 million.

"Candidly, I don't think we even had a thought that this would last anything beyond a single product. We're now the number one … in the U.S., Europe, China for all gaming peripherals (hardware) at this point of time," Tan told CNBC's "The Brave Ones."