A button that only ever means one thing

There is one button on Razzhood Glasses. It is on the right temple, near the hinge, where your index finger lands without being asked. It has a raised texture so you can find it with your eyes closed, and a tactile dome so you feel the moment it commits.

It records. Press it and recording begins; press it again and recording ends. It has never done anything else, in any state, at any time.

Modes are a tax you pay forever

The standard way to build this product gives the button several jobs. Short press for play-pause, double press to skip, long press for the assistant, press-and-hold to record. It is efficient in the sense that one piece of hardware covers four functions. It is expensive in the sense that the user now has to know which state the device is in before pressing anything.

That cost is invisible on a specification sheet and enormous in a pocket. It shows up as hesitation — a quarter second where you ask yourself what will happen — and hesitation is exactly what kills a capture device. The entire value of a wearable recorder lives in the gap between having the thought and starting to speak. Add a decision to that gap and the product loses.

Whatever is happening, one press means record. That is the whole specification.

Where everything else went

Onto your phone. Play, pause, volume, answer, hang up — all of it stays where you already know it is, in the interface you have used for every Bluetooth headset you have ever owned. We add nothing there and we ask you to learn nothing.

People sometimes read this as a cost-saving measure. It is the opposite: it is a decision to leave capability on the table so that one control can stay unambiguous.

Why not press-and-hold

Hold-to-talk is a good design for short utterances. A voice ring using that pattern is built for three to six seconds — a command, an address, a reply.

Our case is a paragraph, sometimes several, sometimes four minutes of working something out while walking. Holding a finger against your temple for four minutes is not a thing anyone does twice, and outdoors, with a bag or a dog lead or a child's hand in the other, it is not a thing anyone does once.

So the button toggles, and something else has to end the recording.

Silence ends it

Thirty seconds without speech and the recording closes on its own. It follows the rhythm of the speaker rather than a stopwatch, and there is no maximum duration to interrupt you — if you have ten minutes to say, nothing cuts in at minute two.

Outdoors this is subtler than it sounds. A street is never quiet, so a loudness detector would never fire. The rule is not "is there sound" but "is the difference between the two microphones still large" — and that difference collapses the moment you stop talking, however loud the world happens to be. The same two microphones that keep the room out of your recording are what tell the glasses you have finished.

Two seconds and sixty seconds

Two rules protect the button from the real world. Anything under two seconds is discarded — that was your pocket, and you will never see a library full of it. And two recordings less than sixty seconds apart merge into one note, because stopping to think should not shred a thought into fragments.

Both rules are invisible. That is the standard we hold the interaction to: the user should never have to know they exist.