The Smart Ring Health Tracker is a unisex size 6 activity tracker that monitors sleep, tracks step count, and measures pulse rate. It features a display resolution of 240 x 240 and is powered by batteries. Made of stainless steel, this black smart ring is suitable for both indoor and outdoor activities and provides measurements in both decimal and imperial systems. Designed for Android operating systems, it also includes features for running and jogging, as well as a built-in infrared sensor for added convenience. With a 1-month manufacturer warranty, this smart ring is an ideal companion for tracking your fitness goals.