Suitable for most hats, providing easy illumination. This LED lamp features 3 adjustable brightness settings: high, medium, and low—allowing you to select the ideal brightness for use in low-light conditions. USB rechargeable: compatible with any standard USB port. Can be charged using a car charger, computer, wall adapter, or portable power bank. Charging indicator turns red while charging and green when fully charged—simple and convenient. Easy to install and replace: if your hat already has an LED knit beanie light, simply remove the broken unit and replace it with this one. For hats without built-in lights, cut an opening in the fabric to match the light’s shape. Includes leather straps for secure attachment—sew the straps onto your hat and mount the light. Ideal for hands-free task lighting in various locations. Simple to operate and clean: press the center button to cycle through brightness levels. To clean, gently press and remove the light cap from the lamp, then wash the beanie as usual. Versatile use: suitable for walking dogs, camping, hunting, snow shoveling, fishing, cycling, running, hiking, barbecuing, and automotive maintenance. A practical hands-free lighting solution for many activities. Material: plastic Color: black Package includes: 4 × rechargeable LED lights Note: Color may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.