Turn it on, and slap it onto the wrist, upper arm, or ankle for instant nighttime visibility. Powered by a bright, easy-to-activate LED that lights up the entire wrap. Made of durable nylon patterned with a reflective spider web design. Bright Red LED provides active illumination with Glow or Flash Modes. Includes easily replaceable battery. 3.9 x 1.5 x 0.4".