Our flashing blue plastic LED Dolphin Necklace comes with 3 different light settings;; slow flash, fast flash and steady on. Choose your favorite setting with a click of the on/off button. Our blue plastic LED Dolphin Necklace Is a perfect accent to your beach,tropical or ocean theme parties! Each LED necklace has 7 - 2 3/4" translucent plastic dolphins which flash and light. 2 - CR2032 button batteries are included, installed and can be replaced.