TL;DRHealth tech startup Vital Signals has announced the Signal Ring, a $399 smart ring claiming to deliver direct systolic and diastolic blood pressure readings without a traditional arm cuff or calibration setup.Launching without a subscription model, this smart ring claims to track continuous fluctuations and overnight trends to compete with established rivals like the Oura Ring 5 and RingConn Gen 3.Pre-orders are currently open and include a sizing kit. Shipments are expected to begin later in October.The smart ring market is expanding rapidly, but a new contender wants to move the needle beyond basic sleep tracking and heart rate monitoring. Three-year-old health tech startup Vital Signals has officially announced the Signal Ring, a $399 wearable that claims to deliver accurate systolic and diastolic blood pressure readings straight from your finger, completely bypassing the need for a traditional, bulky arm cuff.While heavy hitters in the wearable space have struggled to bring cuffless tracking, the Signal Ring aims to set a new benchmark. It targets a space currently dominated by smart ring options like the Oura Ring 5 and the RingConn Gen 3, both of which provide blood pressure trends and vascular trends, but not direct readings.