Surface signal device. Bright HiVisibility orange.40" long X 7.5" circumference. Independently inflated with mouthpiece. To signal at night simply hold an AKONA light to the safety tube.Includes a 5.5" X 2.75" nylon carry bag with an easy attachable snap clip. To inflate, pull out the nipple at the bottom of the tube, inflate with air and push nipple back in to close the opening.