Light Up Arm Bands for Night Safety are the next level in our line of nighttime safety lights for exercise and visibility. Fasten to your arm or leg, even your wrist, for maximum night visibility! Go for a good ol' night run, join a light-up 5k or marathon, or just wear them out to the club. To activate your Light Up Safety Armbands, remove pull tab & press button for 2 light functions: Steady light & blinking. LED Light Arm Bands for Night Safety come ready to use with 2 replaceable CR2032 Batteries.