[Visibility and safety] Our LED lamp beads have two modes. The white light illumination mode ensures that you can see clearly at night or in the dark; the red and blue lights alternately flashing and the alarm mode makes you work or exercise safer in the dark, lighting The running time of the cap can be up to 4 hours.[Removable and washable] Just pull the edge of the led knitted beanie and push the lamp inward to separate the lamp, wash the hat or charge the lamp, without any additional wires. There is a hole on the edge of the Bluetooth device, when you want to clean the LED music peas, you can easily remove and install the earphones.[WIRELESS BLUEBOOTH V5.0] Bluetooth music cap adopts stable and powerful V5.0 Bluetooth connection technology, any smart Bluetooth device can be easily paired within a few seconds (transmission distance up to 33 feet), built-in stereo speakers and mic, The led bluetooth cap also supports music and phone calls. It can be used continuously for 10-12 hours after 1.5~2 hours of USB charging.[USB charging and excellent music] This bluetooth LED beanie does not need to repurchase and replace the battery, just from the standard USB port of the computer or mobile phone charger. The upgraded speakers provide excellent stereo sound and enjoy an enhanced music listening experience. The simple 3-button control panel can make calls, search for songs and control volume.[Universal size and ideal gift] This winter warm LED hat has elasticity and elasticity, suitable for most teenagers, men and women. It is very suitable for daily wear, including indoor and outdoor activities such as camping, biking, barbecue, car repair, fishing, jogging, dog walking, skiing, snowboarding, running, traveling, hiking, motorcycle riding. It is also an ideal gift for birthday, Thanksgiving, Christmas and New Year.