Notes
Eleven decisions, each written out in full, including the one we later overturned.
Engineering
Why the main microphone in Razzhood sits under the lens rim rather than on the temple, and why three centimetres of placement beats any noise-cancellation algorithm.
Design
How Razzhood avoids recording bystanders with two microphones and a level-difference threshold, and why a physical guarantee is worth more than a software promise.
Design
On the audio-only pair we removed every light, on the grounds that it physically could not record a bystander. Adding a camera takes that ground away — so the light is back.
Product
Why this pair takes 4K photographs and five-second clips only, why a film strung together from interval shots is better to watch than continuous footage, and where the money this decision saved went.
Engineering
Why Razzhood has no power button, how deep sleep and a pre-roll buffer make press-to-record instant, and why recording never touches Bluetooth.
Engineering
How Razzhood cuts a recording into five-minute segments with a one to two second overlap, why five rather than ten, and why an invisible engineering decision should take the conservative number.
Opinion
Why what a pair of glasses can do should not be decided by the people who make the glasses, what we are opening, and the applications we do not intend to build but hope somebody else will.
Lenses
Why Razzhood lenses are UV400 tinted rather than polarised, how polarisation fights your phone screen, and why a dark lens with no ultraviolet protection is more dangerous than none at all.
Design
Why Razzhood makes only two frame colours and two lens tints, why all four are pale, why pink is not a women's colourway, and why a very pale warm tint makes your gaze read clearer to other people.
Engineering
Why it still comes in under 40 grams with a camera in it: the power, the battery and the thermal structure saved by not shooting long video are worth far more than shaving material.
Opinion
Building an AI-era wearable on something people already own and already wear, instead of asking them to accept a new object — and what that constraint deleted from the design.