【VISIBILITY & SAFETY】There are two modes about our LED lighting beanies, white light lighting mode ensure you can see clearly in the evening or dark; the red and blue light flashing alternately alarm mode make you worked or sported more safer in the dark night, and the runtime for the lighting hat can last up to 4 hours.【DETACHABLE & WASHABLE】Just need pull the rim for led knitted beanie open and push the light inward to separate the light and wash the cap or charge for the light, no any extra wires. There a hole in the edge of bluetooth device, which is makes the headphones easy to remove and install when you want to wash the LED music beanie.【WIRELESS BLUEBOOTH V5.0】The bluetooth music hat with stable and stronge V5.0 bluetooth connectivity technology, any intelligent bluetooth devices can be paired with the hat easily in seconds ( transmission distance up to 33 feet), built-in stereo speakers & mic, led bluetooth cap also support music and phone, USB charge 1.5~2 hours can lasted use for 10 to 12 hours.【USB CHARGE & EXCELLENT MUSIC】 No need re-purchase and change batteries for this Bluetooth LED beanie, only a standard USB port from the computer or mobile phone charger. Upgraded loudspeakers offer excellent stereo sound, enjoy enhanced music listening experience, simple 3 buttons control panel to calls, find songs, ro control volume.【UNIVERSAL SIZE & IDEAL GIFTS】This winter thermal led hats are stretchy & elastic, can fits for most teens, mens, womens. Perfect for daily wearing including indoors and outdoors activities, such as camping, cycling, grilling, auto repair, fishing, jogging, walking your dog, skiing, snowboarding, running, traveling, hiking, motorcycling. Also is a ideal gift on Birthday, Thanksgiving Day, Christmas, New Year.