Built-in 180 LEDs: Built-in 180 LEDs, brighter and up to 150m long-distance visible, keep you safe while running at night, IP67 waterproof, shine even at raining day Long Working Time: Built-in 180MAH Li-battery, it can work about 8 hours while full charged, offering you a happy time exciting time continuously Anti-slip Water Drop Shape Pin Design: Be made of ABS+PP, do not hurt the shoes, water drop shapes pin design, anti-slip Easy to be Charged: Built-in rechargeable battery, USB charge.