VISIBILITY & SAFETY: You can adjust the brightness by pressing the button. There are 3 modes for you to choose the most suitable brightness. It can last up to 8 hours in the lowest level, 4 hours in medium level and 2 hours in the highest level.USB RECHARGEABL & EASY-TO-USE: No longer re-purchase and change batteries for your light up beanie, only a standard USB port from the computer or mobile phone charger. press the button in the middle of LED light to switch on/off.AcrylicFastening: ElasticBeanieCONVENIENT LOADING & WASHABLE: Just need pull stocking cap rim open and push light inward to separate them and wash the cap or charge for the light,4 LED lights have high quality IP44 waterproof rating.ELASTIC & UNIVERSAL SIZE: This winter warmer LED knit hats can fit wide range of head sizes for most kids, men, women, with high elastic and comfortable.BEST GIFT: It is perfect flashlight beenie for camping,party,cycling, grilling, auto repair, fishing, jogging or walking with dog in the cold winter night. it a perfect gift in Christmas/Birthday/New year for your Child/father/mother/husband/wife/boyfriend/girlfriend.