Feature Highlights: 1. Versatile Compatibility – Fits most knit beanie hats. A complete set makes it easy to add hands‑free light wherever you need it. 2. 3 Adjustable Brightness Levels – Choose from strong, medium, or soft light to match your needs in the dark. 3. USB Rechargeable – Equipped with a standard USB port for charging from a car charger, computer, wall socket, or power bank. The indicator light turns red during charging and green when fully charged. 4. Easy Installation & Replacement – If your hat already has an LED light, simply swap out the old one. For hats without lights, you can cut a small opening to fit the lamp. Includes leather patches for sewing the light securely onto any beanie. 5. Simple to Use & Clean – Press the central button to adjust brightness. Before washing, gently remove the light unit from the hat—then clean the beanie as usual. Product Details: This rechargeable LED light set is designed to give you reliable, hands‑free illumination. Made from durable materials, each light offers three brightness modes and can be charged easily via USB. Installation is straightforward—whether you’re replacing an existing light or adding one to a plain hat. Perfect for keeping your hands free while working, exploring, or completing tasks in low‑light conditions. Specifications: Material: Plastic Color: Black Package Includes: 40 × Rechargeable LED Lights Only the items listed above are included. Note: Slight color variations may occur due to lighting and screen differences. Measurements may have a tolerance of +/- 1‑3 cm.