1.【Bluetooth 5.0 Knitted Hat】Upgraded Bluetooth 5.0 wireless technology offers much stable and strong connection, support music and calling, easy and fast to pair with your devices.2.【LED Headlight Light up the Road】LED light is rechargeable and removable. You can remove it to charge by laptop, power bank, socket, car charger, etc. It points directional light toward what your eyes are looking at. It has 3 brightness settings.3.【Hands-free Calling】This LED Bluetooth knitted hat has feature of hands-free calling. You can short press the ON/ OFF to answer the phone, long press the ON/OFF to hand up, and double click the ON/OFF to redial the latest phone numbers.4.【Removable LED Light and Bluetooth Device】The LED light is easy to install and unload, and it can be taken out by pressing on the reverse side. The Bluetooth device is easy to disassemble and there is a loading and unloading port on the back of the hat. There is a charging port at the bottom of the hat, which is convenient for charging.5.【Wide Range of Use】This beanie hat is made from the ultra-soft material that provides excellent insulation against cold winter air. Elastic and comfortable LED bluetooth hat fits men, women and teens. It is washable. Please remove the LED and the headphone before washing.