Illuminated Reflective Running Vest and Armband Set with LED Fiber Optics and 3 Flashing Modes Provide 360-Degree Visibility Up To One-Quarter Mile RUNNERS SAFETY BUNDLE includes one LED illuminated reflective vest and LED safety armband. One size fits all. Vest requires 2AA Batteries and Armbands require 2- CR2032 Batteries each LIGHTWEIGHT AND ADJUSTABLE for use with any types of clothing. Fits over a t-shirt or a jacket and has minimal contact with your body, so it wont impede your mobility. Weighs just 7 ounces 360-DEGREE VISIBILITY from  mile in any direction. Alert drivers to your presence with 2 powerful LEDs and 3M reflective tape. Maximizes safety for cycling, walking or running after dark FLEXIBLE NYLON ARMBAND curls around your wrist and is secured by a tough Velcro strap. Powered by 1 small button battery, it illuminates much more brightly than glow sticks. Ideal for men and women 3 FLASHING MODES with 2 solid colors (currently) to select from. Switch modes at the touch of a button, even while you are running or cycling, to insure that you get the attention of distracted drivers