Size: 32 x 2.5cm; Material: nylon band + LED; 3 modes: steady, fast strobe, slow strobe (controlled by switch); Powered by 2 x CR2032, batteries are replacable; LED glowing time: 60~80 hours, normal use: 2~3 months; Water resistant; Band is washable (remove the electronics); Good for outdoor sports, such as night running, cycling, etc, also suitable for evening party cheering.