Description LED: two red LEDs; Battery: 1*CR2032; Function: pressing switch, press one time for lasting lighting, twice for two LEDs quick blinking, three for two LEDs?interlaced quick blinking; four for off; Feature: This small red safety light is ideal for walking, running, biking or any other night time sport activity; Three settings allow for variable degrees of flashing recognition; The elastic band can be used for the easy and quick fixation at the helmet, arm or any bag; Its appearance is very vogue and beautiful. Please note: even though this light makes others aware of your presence, please use with care. Replace batteries when needed. Size: 5.20*3.32*2.90CM Package QTY: 100PCS/CTN, G.W/N.W: 13.0/11.0KGS, MEAS: 60*40*40CM