This adjustable reflective 4-LED armband set 2 pcs is ideal for sports or while cycling in the dark. Two different lighting options. The LED lights increase visibility and safety. Equipped with a 2 CR2032 batteries. Features: 4 LEDs 2 Lighting options 2 CR2032 batteries Specifications: Color: yellow Material: polyester Gender: unisex Closure: velcro Batteries: yes Size: onesize