The wearables product maker, which counts Deutsche Telekom among its investors, raised the cash from BlackRock and has inked a joint development deal with Amex.

Jawbone, the US-based wearable technology maker backed by telecommunications firm Deutsche Telekom, has received $300m in funding from asset manager BlackRock, Re/Code has reported.

Founded in 1999, Jawbone produces wearable products and is best known for manufacturing portable speakers and fitness trackers that are worn on the wrists.

The funding was revealed as Jawbone launched a new activity tracker, the Up3, and announced a deal with payment services firm American Express to jointly develop a new tracker, the Up4, that…