Three finishes. One instrument.
The body is the material we are honoring. The Ring is the material we have chosen. Aerospace titanium, zirconia ceramic, and, for the Founding Hundred only, a single brushed bronze.
Standard
Titanium · Brushed
Aerospace grade. Hypoallergenic. The instrument disappears.
Standard
Ceramic · Polished
Zirconia. Will not scratch. A small ivory mark on the hand.
Founding Hundred only
Bronze · Brushed
Numbered. One per Founder. Patinas with the body.
The Body
Single-piece construction. No welds. No glue.
- Outer shell
- Grade-5 titanium, machined from a single billet, then bead-blasted to a fine matte.
- Inner band
- Medical-grade epoxy. Engraved with your Member Number. Read once, then forgotten.
- Wall thickness
- 2.55 mm. The thinnest we could make it without losing the antenna.
- Width across the band
- 7.9 mm. Sized to disappear under a watch.
- Weight, titanium
- 3.4 g at size ten. Lighter than most wedding bands.
- Weight, ceramic
- 4.1 g. Slightly heavier. The instrument announces itself less.
The Sensors
Six measurements. Continuous. Quiet.
- Heart rate
- Optical, infrared. Sampled every five seconds at rest, every one second in motion.
- HRV
- RMSSD computed nightly across the deepest hour of sleep.
- Temperature
- Skin-contact, two points. Variation of 0.05 °C resolved.
- Blood oxygen
- SpO₂. Sampled overnight. The Brief speaks of it only when it changes.
- Movement
- 3-axis accelerometer + 3-axis gyroscope. 200 Hz.
- Sleep stages
- Awake · Light · Deep · REM. Inferred, then confirmed against ten thousand polysomnograms.
The Power
A small battery, considered.
- Battery life
- Seven days, typical. Five with continuous SpO₂.
- Charging
- The Dock. A single circle of brushed steel. Forty minutes to full.
- Cycles
- Rated to 800 cycles. Replaceable, by us, after five years.
- Water
- Worn in the shower, in the ocean, in sleep. Rated to 100 m.
Wear it. Forget it. Return it for service every five years.
The Ring needs no ritual. No special case, no nightly cleaning, no oils. The shower is enough. Salt water is fine. A drop on the sink is fine.
Every five years, mail the Ring back to the Temple. We will service the battery, refinish the body, and return it within ten days. Worn rings are kept; replacements are numbered to match.