Williams Sound PKT PRO1-3 Pocketalker PRO System Amplifier with Folding Headphone, 100 hours of battery life, Adjustable volume control/internal tone control, Accommodates a variety of earphone and headphone options 100 hours of battery life, Adjustable volume control/internal tone control Accommodates a variety of earphone and headphone options Use with neckloops and telecoil-equipped hearing aids Amplifies sound for better understanding Includes: (1) PKT PRO1 amplifier, (1) HED 021 folding headphone, (1) BAT 001-2 two AA alkaline batteries, (1) WCA 007 extension cord, (1) MIC 014 microphone, (1) CCS 001 belt clip case and (1) CCS 008 pocketalker system carry case