This pen looks like a stylish dual-sided mini mirror design until you activate the 8 hidden dazzling LEDs... then it turns into a multicolor never-ending infinity tunnel effect that is viewable from both sides. 3 light-up modes, including fast flash, slow flash, and constant-on. When off, the mirror completely hides the LEDs so the infinity effect will be a total surprise to anyone. Each side of the pen is a different color plastic (sorry, no individual choice of color). Comes with a black lanyard to wear around your neck. Mirror is 1.5" diameter. Pen length is 5.75" Takes 3 replaceable AG13 batteries (included).