HIYD Gen 2 Sensor
Subscription-free biometric sensor that clips under any watch caseback
hiyd.ai/products/hiyd-gen-2-reservation
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About
HIYD Gen 2 is a 2.7mm optical health sensor that sits behind a traditional watch and tracks steps, workouts, calories, sleep, heart rate, HRV, skin temperature and blood oxygen, syncing to the HIYD app over Bluetooth. It is a one-time purchase with no subscription, moves to an included SoftBand when the watch comes off, and is slated for a November 2026 Kickstarter launch, with refundable reservations open now.
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- Hardware