AI notetaking hardware has taken off over the past couple of years, with credit-card-sized devices, pendants, pins, and even transcribing earbuds all promising to capture your meetings and turn them into summaries and action items. Now, a whole wave of wearables — rings especially — are betting people want to capture stray thoughts and ideas the same way. 

One of the companies chasing that bet is Sandbar, the startup behind the private voice ring Stream, which has raised $36 million to date, including a $23 million Series A led by Adjacent and Kindred Ventures. 

On this episode of TechCrunch’s Equity podcast, Rebecca Bellan talks with Sandbar co-founder and CEO Mina Fahmi about why he thinks so many voice hardware devices before Stream struggled to break through, and why he’s betting that keeping the human firmly in control is what it’ll take to get wearable tech right. 

Listen to the full episode to hear more about: 

• Why Fahmi designed Stream to be push-to-talk instead of always-on, and what he thinks “social acceptability” means for wearable AI. 

• How Fahmi’s time at CTRL-labs, the neural interface startup Meta acquired in 2019, shaped his thinking on human-driven input. 

• Why Sandbar chose the “gruelingly painful” path of building fully custom hardware instead of reskinning an off-the-shelf device. 

• What Fahmi thinks it’ll take for voice wearables to break out of tech-enthusiast circles and into the mainstream. 

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