Come and Check Our Promo Solutions.Cationic soft and comfortable fabric, lighter to wear. Built in 200MAH lithium battery, recyclable. The Wireless version V5.0 + EDR communicates within 15 meters and is not affected by the signal. The effective receiving range can reach 15m. Wearing it when you sleep can help you sleep better. The Wireless headband is equipped with a free volume manager, which can freely adjust the volume according to the scene. It is suitable for anyone, it is suitable for any place. Pls check inventory and detailed info with us before placing your orders.