Williams Sound PKT PRO1-H26 Pocketalker PRO System Amplifier with HED 026 Rear-Wear Mono Headphones, 100 hours of battery life, Adjustable volume control/internal tone control 100 hours of battery life Adjustable volume control/internal tone control Use with neckloops and telecoil-equipped hearing aids Amplifies sound for better understanding Mild to moderate hearing loss rating