Product description: Size: 18.5 * 3.8cm Color: Red Material: ABS+Silicone+LED electronic components Power supply mode: 2 CR2032 button batteries, replaceable batteries, continuous use for about 40-60 hours Package contents: 1 Luminous Armband or 2 Luminous Armband SUPER BRIGHT LED LIGHTS AND REFLECTIVE MATERIAL - increase visibility and safety during night sports, can be seen while jogging in the dark, while cycling, walking the dog or other outdoor activities. Provide greater visibility than other reflectors and reflective sports equipment. 2 MODES / FAST FLASHING / CONTINUOUSLY BRIGHT - ensures maximum visibility in all situations and can be adjusted according to your needs. Good for women, men and children, can be worn on the upper arm, forearm, legs, ankles, but can also be strapped into a helmet, backpack or school bag. REMOVABLE ELECTRONICS - the luminous bracelets are easy to clean. Packing list: 2* luminous belt