How Ray’s Solar-Powered Health Tracker Works | Chargerless

Technology

Solar Power

Our solar power module harvests energy from outdoor sunlight only. About 1 minute of direct sunlight outdoors per day can sustain operation, depending on exposure and use.

Ultra-Low Power Design

We built our own sensors and integrated them with an ultra-low power processor to minimize power consumption while maintaining accurate health monitoring throughout the day.

Ray worn on a wrist against a blue sky
Health sensors

Advanced Sensors

Ray includes heart rate, temperature, sleep tracking, step counting, and light exposure sensors — all optimized for minimal power consumption without sacrificing accuracy.

Specifications

Designed Lifespan

10+ years

Size

33mm × 11mm × 6mm

Weight

7 g

Design Philosophy

Health tech shouldn't get in the way of living. The Ray is designed to be small, minimal, and needs no user input to function.

Environmentally friendly — no charging accessories, a longer lifespan than other wearables, and a smaller footprint.

Data privacy and openness — your data is for your eyes only, forever. Leave it, export it, delete it; we won't snoop.

Buy once, own forever — no recurring fees, no planned obsolescence.

Ray ships in September 2026

Batch 2 is reserving now for $199, with no subscription. Order Ray, or sign up for production updates from the workshop.

Chargerless Ray