Anker PowerCore+ 26800, Premium Portable Charger, High Capacity 26800mAh External Battery with Qualcomm Quick Charge 2.0, includes PowerPort+ 1 with Quick Charge 3.0 Wall Charger Suitable for people have snoring issues caused by opening mouth to breath when sleeping. Can prevent dry mouth and sore throat. Triangular design: Secure and not easy to loosen, powerful and comfortable to pull up the jaw. High-grade skin-friendly composite material: no irritating smell, comfortable and not itchy. Smooth adjustable double Velcro: no scratching to skin or hair, suitable for different head size to wear. 100% refund guarantee: Our product is designed to meet your need and reach satisfaction. You can get full refund conveniently if you are not fully satisfied with this device.