Signed Nix, the Biosensor is a lightweight, wearable hydration monitor designed for workouts of 45 minutes or more: it analyzes sweat moment by moment to quantify when, what, and how much to drink, whether water or electrolytes. The rechargeable pod, weighing less than 0.5 ounces, attaches to a disposable patch before each workout, reads data, and transmits it in real-time to the Nix app, integrated with smartphones and watches. This device is designed to transform hydration from an empirical attempt to objective data, improving performance, safety, and overall well-being. Package includes 1 pod, 4 patches, a charging case, and a USB cable. Battery life up to 36 hours.