Good Quality -- The armband is made of nylon. Washable, quick drying, water resistant and durable materials. Delighted with the product and LED working very well. The batteries are replaceable, they are located in a waterproof compartment. Perfect for being seen on night walks. Three Light Modes -- The LED wrist band has three light modes: Fast flash, Slow flash and always bright, it can flash or remain fixed, this change of modes takes place very simply thanks to a simple press of a button, you can choose one of them according to your preferences during the activities outdoor. Safety LED -- The armband is made of a reflective material, is highly visible in the dark. Ideal for those who want more visibility, especially in dark or low light conditions, to ensure safety during outdoor sports at night. They clip on anywhere to give you maximum safety when riding your bike or walking in the evening. Lightweight and flexible, easy to wear -- The safety light up sports wristband is designed with of comfort. The LED armband is lightweight and soft to prevent fatigue and discomfort for wearers of all ages. Secure and adjustable Velcro closure comfortable for kids and adults and pets. Versatile LED Armbands -- You can wear it on your upper arm, wrist or ankle when jogging or walking. ride. You can also pair it with your backpack or your bike if you are hiking, you can also wear it for night activities, such as your favorite singer's concert or a campfire party, etc.