Williams Sound PKT D1 N01 Pocketalker Ultra with Neckloop, 200 hours of battery life, Adjustable tone and volume control, Accommodates a variety of earphone and headphone options 200 hours of battery life, Adjustable tone and volume control(Best with Polaroid AAA Batteries) Accommodates a variety of earphone and headphone options Use with neckloops and telecoil-equipped hearing aids Amplifies sound for better understanding Includes: (1) PKT D1 amplifier, (1) NKL 001 neckloop, (1) BAT 010-2 two AAA alkaline batteries, (1) WCA 007 extension cord, (1) MIC 014 microphone and (1) RCS 003 lanyard