Something NEW in personal infrared listening systems. Super small and lightweight “compact” receivers and transmitters in your choice of frequency bands - 95KHz, the “older” popular frequency installed in thousands of commercial locations, and the high band 2.3/2.8MHz stereo frequency that is less susceptible to interference. The receivers are very small - 3.75 in. x 1.0 in. x .75 in.- with a 3.5mm stereo jack to plug in your own listening option. They work with any stereo earphone, earbuds, noise canceling headphones, as well as a comprehensive range of hearing aid or CI accessories including high performance neckloops and silhouettes. A theater tote is included for taking it with you. No “special” batteries are needed. Two AAA alkaline batteries will give up to 140 hours of use. The transmitters connect to the TV audio out jacks. They too are very small, 5.25 in. x 3.5 in. x 1.0 in. Connect to the audio source with the RCA cable included. The 95KHz model includes a small microphone that can be used to pick up sound from the TV speakers on older TVs. The microphone is optional on the high band stereo systems. All transmitters also have a 3.5mm headset jack. Purchase the receiver only for use in your favorite theater, or add a transmitter for a system to use at home. Two year warranty.