Sports activities made safe for low-light environments. The Runtastic Safety Shoe Clip equipped with red LEDs (steady and flashing light) makes running, walking, inline skating or biking in low-light environments safer. Just mount the clip on your shoe (fits shoe size widths between 6 - 8 .5 cm / 2.4 - 3.3 in), switch on the LEDs and you're ready to go!