Flashtastix use the latest technology in LEDs that are so bright and so intense you can see it in broad daylight! An incredible 16 LEDs pulse through a series of ever-changing patterns governed by a complex IC chip. Our image only captures a small portion of the seemingly endless paterns! The intensity is magnified even more by the special epoxy surface. The Flashtastix create an intense, dramatic light show that will not be easily forgotten. The pendant has both a regular on/off switch and a push-to-activate button. Uses 2 extra-strong replaceable CR2025 lithium batteries (included). The heart pendant is a large 1.5" width and 2" length that will get you noticed.