Valencell, which makes biometric sensors that improve the accuracy of fitness tracking in wearable devices, has raised $2.64 million in a combination of equity and debt from five investors, according to an SEC filing.

The company helps wearable device makers measure the reliability, performance and accuracy of products powered by its technology. Valencell got a green light on eight patent applications in February, which [patents] will be used to support its PerformTek biometric sensor technology to track and measure biometric data “on anyone, doing anything, anywhere on the body.”

Among those patents is one describing the use of light as a tool to filter out noise and to help generate physiological parameters for users for heart rate, blood flow and blood pressure. Another covers a photoplethysmography sensor that could be used as an alternative to ECG to monitor heart rate.

Last month, Valencell joined National Sleep Foundations’ council to collaborate with the likes of Beddit, Emfit, Jawbone, MetroNaps, MisFit Wearables, and Responsive Surface Technology to develop innovations in sleep technology.

Last year, the company raised $7 million as part of a Series C round, bringing its total funding to $14 million. TDF Ventures, True Ventures and WSJ Joshua Fund are among Valencell’s investors.

[Via: MedCityNews]