1、 Easy to charge - provide a standard USB interface to charge the battery, you can use a car charger, computer, or power bank to charge, no need to replace the battery! Say goodbye to batteries. 2、 Simple 1 button control LED light - 2 gear settings, white light, and red and blue flash alternately. 3、 One size fits all: Unisex breathable mesh baseball cap with removable and rechargeable SMD LED light that maxes out at 100 lumens for comfort and summer. 4、 More occasions: golf, unloading, dog walking, repairing, night walking, running, cycling, camping, fishing. 5、 Dimensions: head circumference 51-65cm, hat brim size 7.5*17cm. 1* Baseball Cap Material: polyester, acrylicHead circumference: 51- 61.5cmHat brim size: 7.5*17cmLED lamp beads: 4 high-brightness white lights, 1 red light, and 1 blue light, a total of 6Battery capacity: 250mahCharging time: about 1.5 hoursBattery life: white light on for 4-8 hours, red and blue flashing for more than 10 hoursLED Brightness: 100lmWhite light color temperature: 8000-10000K