GlowCity LED Light Up Armbands 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)