If you have trouble hearing, the Pocketalker PKTDEH Ultra Amplifier is the perfect tool to help amplify the sounds and reduce intrusive background noise. The Pocketalker Ultra is ideal for one-on-one conversations, small group chats, listening to the television and car conversations. Simply plug in your earpiece, position the microphone near the preferred sound, adjust volume to your comfort and start listening. Featuring an impressive battery life of up to 200 hours, hearing aid compatibility, folding headphone and single earbud, this amplifier is sure to impress. Audio Amplifier Features Audio Drivers: Earbud 13mm, Headphone 30mm Cable length: 0.9m (2.9’) Frequency Response: 20 - 20 kHz Hearing Aid Compatible: Yes Microphone: Yes Microphone type: Omnidirectional Microphone Frequency Response: 20 - 16 Hz Battery Life: Up to 200 hours