Feature: 1. LED safety lights with luminous bands help to improve visibility and safety at night, making running, walking, biking and other outdoor sports safer at night. 2. Lightweight and comfortable to wear, it is not restricted by movement and will not cause tangles even if it is directly attached to the skin. 3. The strap with the adjustable buckle can be adjusted to fit almost any arm size, just tie it to your arm, wrist or calf, press the button and use it. 4. The 3 gear lighting mode can be switched freely, there are fast flashing, slow flashing, and constant light. 5. With adjustable hook and loop straps, suitable for outdoor night sports, such as walking, cycling, concerts, camping, outdoor sports, etc. Specification: Item Type: LED ArmbandMaterial: Nylon Webbing+Plastic+PU FiberColor: As Picture ShownWidth: Approx. 2.5cm/1.0inExpand Length: Approx. 24cm/9.4inWeight: Approx. 19.0g/0.7oz Power Supply: 2Pcs CR2016 Button Batteries 75mAh (built-in) Lighting Mode: Fast flashing, slow flashing, constant light (controlled by switch). Package List: 1 x LED Armband