The 16 LED Reflective Safety Vest is ideal for walkers, joggers, bikers, construction workers, traffic directors, or anyone who is out at night! The vest has a one size fits all design made of flexible lightweight mesh with a highly reflective fluorescent material. It even has a pocket for your cell phone, iPod or other portable devices. 16 super bright LED lights can stay on continuously or flash 150 times per minute. LEDs require the use of two AA batteries, sold separately.