1,Humanized design, comfortable release buckle design, firm and not easy to fall off, adjustable elasticity, suitable for different groups of people. 2,Reflective and luminous arm bands on the lattice surface help to improve visibility and safety at night, it makes running, walking, biking and other outdoor sports safer at night. 3,Just tie it to your arm, wrist or calf, press the switch button, and it will work. The 3‑speed light mode can be switched freely, fast flashing, slow flashing, and constant light. 4,Adjustable wearable silicone running belt, suitable for outdoor night sports, such as jogging, walking, cycling, concerts, camping, outdoor sports, etc. 5,It comes with adjustable straps that can be strapped to the arms, wrists, calves or anywhere else you like. 1 x LED Armband Item Type: LED ArmbandMaterial: Polyester and nylon and plastic Color: As Pictures Shown Product Size: Approx. 16.5x4cm or 6.5x 1.6inArmband circumference: Approx. 30cm or 11.8 (elastic and adjustable)Weight: Approx. 28g or 1ozPower supply: 2 x CR2032 button batteries 200mAh (built-in)Light mode: quick flash, slow flash, constant lightFeatures: Adjustable anti-slip buckle, 3 speed light switch, elastic belt, lattice light belt Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.