Improve what you're listening to! - improve your hearing with the PKT D1 EH Pocketalker Ultra from Williams Sound! The Pocketalker Ultra amplifies sounds closest to the listener while reducing background noise. The Williams Sound Pocketalker Ultra features a lightweight, ergonomic design for portability and ease of use. Finger tip adjustable volume and tone controls allows you to quickly adjust to your listening environment - whether your hearing loss is low frequency or high frequency sounds. The listening accessories jack accommodates for a variety of earphone and headphone options. The Pocketalker amplifies sound clearly and easily for better understanding. 100 hours of battery life ensures longlasting performance. Each Pocketalker includes a plug-in sensitive microphone; and for the TV listener: a TV listening extension cord. Use the Pocketalker with a variety of available earphones and headphones of your choice, or, a neckloop and a telecoil-equipped hearing aid. Includes EAR 013 Single Mini Earbud and HED 021 Deluxe Headphone ; Dimensions: 3.38"L x 2.23"W x .88" THK. (85.8mm x 56.6mm x 22.3 mm) (Not including belt clip or microphone assembly); Battery Type: Two 1.5V (AAA size) alkaline; Battery Life: 100 hours (typical usage); Tone Control: External rotary control knob to allow user to optimize hearing; Volume Control: External rotary control knob with power ON-OFF switch.