1.Built-in 12000mAh fast charging battery lasts longer for headstrap use. 2.The protection device turns on when the battery and headstrap are under load. 3.Adjustable knob to adjust the dimension of the headband for both adults and children. 4.Easy to put on and take off, with rotatable pivot points on the side of the headstrap. 5.The head strap is ergonomically designed to give players a better, more comfortable experience when playing.