Former Best Buy CEO Brian Dunn is getting back in the game.

Three years after he left the Richfield-based electronics retailer, he is joining Minneapolis tech startup Upsie as its chairman effective June 1.

Upsie, which allows consumers to buy a warranty for smartphones, televisions and other devices, launched its smartphone app in November. The company says it now has over 50,000 users.

In a blog post, Upsie said it is "confident" Dunn will help the startup move faster and strategically to accelerate its growth and strengthen its leadership team.

"Brian's 27 years of cutting-edge consumer electronics business experience and entrepreneurial philosophies bring a wealth of knowledge and expertise to Upsie," the company said on its blog. "For our team, Brian's extensive knowledge in developing people and leaders additionally will improve our leadership and ability to deliver world-class customer experiences."

Dunn resigned from Best Buy in 2012 after three years in the top job amid allegations he used company resources to carry on an affair with an employee. His abrupt departure set off a turbulent time for the retailer.

An Upsie spokeswoman declined to provide further details about Dunn's new position at the startup and how involved he will be in the day-to-day operations. But it appears he will be taking an active role. Dunn tweeted on Wednesday that he will "dive in" on June 1.

Clarence Bethea, CEO of Upsie, recently told the Star Tribune that his startup offers warranties for lower prices than many retailers offer in their stores and help them keep track of it by storing it within the app on their smartphone.

"Our main focus at Upsie is to give consumers another choice," Bethea said. "A lot of consumers don't know that you don't have to buy at the register. You can go home, think about it, and not have to feel that pressure from that salesman who's pitching you really hard so he can make a commission off of it."