Dealzip Inc LED Sports Armband,High Brightness Shocker Adjustable Night Magnetic Bicycling Running Hiking Outdoor Activities Safety Reflective Rolled LED Armband Bracelet Made from premium grade material: Nylon straps & LED lamp & Optical Fiber Material & Velcro. Powered by 2PCS CR2032 Button Battery (pre-installed & Replaceable). The Life of Battery is up to 50 Hours. 4 Flashing Modes: On/Off; Fast Flashing; Slow Flashing; Steady. (Contolled by Switch) Perfect accessories for night outdoor activities: sports, bicycling, jogging, walking, running, hiking, street dancing and so on. One Size: 2.5 * 30-35CM (Adjustable). There are 7 bright colors for selection: Red, Yellow, Orange, Green, Blue, White, Pink.