Michigan spinout Vesper's investors include Amazon's Alexa Fund, AAC Technologies, Mirae Nano Tech and XinGang Electronics.

Vesper, a US-based advanced acoustic sensor developer spun out of Michigan University, secured $15m on Friday in a series A round backed by e-commerce and cloud computing company Amazon’s Alexa Fund.

Accomplice, the venture capital firm formerly known as Atlas Venture, led the round, which also featured acoustic component producer AAC Technologies, investment firm Hyperplane, optical film manufacturer Mirae Nano Tech and undisclosed other investors.

Vesper is working on advanced microelectromechanical systems (MEMS) microphones for use in smartphones, smart cities,…