Made of nylon matarial and LED electronic components, our rechargeable LED armband avoid the hassle of frequent battery replacement and battery cost, one charge lasts up to 5-6 hours. Our running lights are perfect for people who want to feel safe, and engage in outdoor activities such as walking dogs, jogging, and biking in low-light conditions; 7 Light Colors & 3 Light Modes, choose a light color to match your style.