Playing in the crowded sea, if you encounter danger, the sound of help will often be drowned out by the sound of people and waves. Even with lifeguards watching from the tower, danger is still hard to avoid. According to this situation, the designer launched this first aid bracelet. Users can wear it on the wrist, lightweight shape so that it does not interfere with the user's swimming movement. If you encounter danger, you can activate the mechanism on the bracelet, the Red Cross balloon hidden in the bracelet will quickly inflate, and then float into the sky, so that the lifeguard can detect the dangerous situation, easy to locate the location of the person in danger, and take emergency measures.