Smaller than other approved lights. Rounded edges to maintain the integrity of inflatable life Jackets. Attachment loops work up to 5 cm (21 wide webbing. Marine tough design. High-intensity flashing LED light automatically activates for 20+ hours when in contact with salt or fresh water. Easily retrofitted to almost any style life jacket and attaches to almost any style life jacket to safely meet USCG, MED and SOLAS requirements.