Specification: Light Source: LED Name: LED knitted hat light Hat Material: Acrylic fibers Hat size model: Adult models are unisex, suitable for European and American adults Charging method: USB port Uses: Mountaineering, camping, night fishing...etc Applicable season: Spring, autumn and winter Lamp Size: 54mm x 48mm x 14mm/2.13" x 1.89" x 0.55" (Approx.) Cap Size: 215mm x 205mm/8.46" x 8.07" (Approx.) Products include: 1*USB Rechargeable Headlamp Cap