Two Lighting Modes -The light bands have three lighting modes: faster flashing, even glow, you can choose any of them as your preferred mode for outdoor activities. Weatherproof with non-slip stretch tape -The running reflectors, which have a length of 20 to 40 cm, are adjustable, they are suitable for most men, women and children. You can wear them on your wrist, ankle, and arm. Weatherproof with non-slip stretch tape -The running reflectors, which have a length of 20 to 40 cm, are adjustable, they are suitable for most men, women and children. You can wear them on your wrist, ankle, and arm. Interchangeable batteries - Powered by two pieces of CRV2032 lithium button cells, the wristband can work for about 60-80 hours. The batteries can be replaced when the current is low. Where to use the LED armband? This LED armband is a must have for outdoor activities. You can wear it on your upper arm, wrist, or ankle when you jog or walk the dog. You can also pair it with your backpack or bike when hiking or biking. With highly reflective material and highly visible light, the LED armband can prevent the potential danger and guarantee people's safety. What are the advantages of our LED armband? Bright lighting. With the reflective material, our LED wristband is much brighter than similar products, ensuring the safety of the outdoors. Better quality. There is exquisite sewing with good nylon material and environmentally friendly transparent PVC material, so the LED armband is convenient. Battery is easy to change. Behind the switch button is the battery compartment, it is very open, you can use a coin or a screwdriver to open and change batteries. It is very comfortable. How do you use the LED armband? Press once for permanent lighting Press twice to blink Press the third time to turn off warranty Note: Do not forcefully open the black battery case. If you want to change the batteries, please be sure to follow the replacement instructions in the pictures.