Vital Signals Opens Pre-Orders for $399 Signal Ring Blood-Pressure Monitor

Vital Signals has opened pre-orders for the Signal Ring, a wearable that delivers continuous blood pressure monitoring without a cuff or regular calibration. The device costs $399 and will be available in U.S. sizes 5 through 13.

Shipping begins no earlier than October, Engadget reported. The ring carries a three-day battery rating and ships with a charging case that supplies four additional charges. Users receive passive readings throughout the day and can trigger manual measurements by sitting still and performing slow breathing exercises.

They can also tag readings with context such as exercise, meals, smoking, or coffee consumption. Tom Moss founded Vital Signals in 2023 after recording a systolic blood pressure of 250 mmHg that required hospitalization. The healthy upper limit for systolic pressure is 120 mmHg.

Moss, an early Android team member who later co-founded Nextbit and served as COO at Skydio, partnered with two engineers from Masimo to develop the ring over three years. The company’s algorithms generate readings without monthly subscriptions or built-in AI features. Data can be exported for external analysis.

In January the FDA began work on broader exemptions for optical heart-rate devices that measure blood pressure. Moss said the product targets people with hypertension rather than general wellness tracking. The ring uses industry-standard components, with differentiation coming from the software that avoids calibration drift common in other cuffless systems.