Unisar DH900 TV Listener | Wireless Digital TV Audio Assisted Listening Device System Hearing-aid compatible. Compatible with TV sets, iPhones, iPods, and CD and MP3 players. Features 2.4 Ghz Wireless RF Technology. Has a built-in microphone to amplify conversations around you. Won&#039;t interfere with cordless phones, garage doors, microwaves, or other in-home electronics. Under the chin stethoscope style. No complicated wiring or set up. Ideal for seniors or anyone with hearing loss. Shipping weight: 1.2 pounds Visit Verseo&#039;s YouTube channel for step by step instructional video on how to set up the transmitter.