Sandbar raises $23M Series A for its push-to-talk AI ring

Sandbar wants its AI wearable to be heard, not always listening. The startup has raised a $23 million Series A led by Adjacent and Kindred Ventures to scale production of Stream, a voice-first ring designed to sidestep the pitfalls that have sunk earlier AI hardware attempts.

The new round brings Sandbar's total funding to $36 million. That capital is going toward a product built from the ground up rather than assembled from existing parts: the company designed custom hardware for Stream instead of adapting an off-the-shelf ring or wearable chassis.

Co-founder and CEO Mina Fahmi brings relevant pedigree to the bet. He previously worked at CTRL-labs, the neural interface startup Meta acquired in 2019, giving him a front-row seat to the hardware and interaction-design challenges that come with building devices meant to sit directly on the body.

Push-to-talk, not always-on

Stream's core design choice sets it apart from much of the current wave of AI wearables. Rather than continuously recording ambient audio, the ring operates on a push-to-talk model, activating only when the wearer deliberately engages it.

That distinction matters both technically and culturally. Always-on voice devices have repeatedly run into privacy backlash and battery constraints, two of the recurring reasons cited for failed AI hardware launches. A deliberate-activation model sidesteps the always-listening controversy while also easing power demands on a device small enough to wear as a ring.

Sandbar is betting that voice, not screens or cameras, is the more durable interface for personal AI hardware.

The wearable AI space has churned through high-profile disappointments, from pins to necklaces that promised ambient assistance but struggled with battery life, accuracy, or consumer trust. Sandbar's pitch is that a narrower, intentional interaction model, paired with hardware built specifically for the task, gives Stream a better shot at avoiding that fate.

Whether a ring form factor and push-to-talk voice input prove durable with consumers remains to be tested at scale. But the fresh capital gives Sandbar runway to move from custom-built prototype toward broader production, with Fahmi's hardware background and the backing of Adjacent and Kindred Ventures as its immediate proof points.