button battery Not includedThe battery needs to be installed under the ring Description: (Note:It should be acceptable that the hat would have crease due to long distance shipment. Notice: Please pull the insulation film out before turn on the light ; and it is only suitable for cell button battery,not for charging.) Feature: Built-in 4LED head light,3 types of light brightness. Easy to use: light turns on with the switch! Keep warm and provide protection for you in the cold weather at night . Suitable for outdoor activity,such as hiking,climbing, fishing ,and so on. Soft and comfortable,and suitable for most people without the sex difference. A sweet gift to your family member and friends. Specifications: Material: spandex Pattern: solid Light source: LED LED quantity: 4led Battery: 2x button batteryNot included Package Included: 1X LED Beanie Hat button battery Not included