vofit 4 activity tracker with 1 year battery life and color display small medium black auto compass

features always on customizable color display and 1 plus year battery life; no charging necessary. safe for swimming and showering tracks steps, distance and calories burned, monitors sleep and provides a personalized daily step goal (heart rate monitoring not available on this product) width is 0.75 inch and thickness is 0.37 inch. circumference for large is 5.83 to 8.46 inch and circumference for regular is 4.80 to 7.40 inch. display size is 0.43 x 0.43 in inches and display resolution is 88 x 88 pixels.syi