LED Light Up Armbands-Blue. LED Armbands, High Quality, and Very Bright from GlowCity. Reflective backing maximizes brightness - Easily Seen from a mile away!. Excellent product for night walks, bicycle night rides, glow runs, and more!. Great Safety Lighting for on the job such as: night parking lot employees, valet drivers. Easily replace batteries, Uses 1 CR2032 Battery (Included).