Flexible and simple. The Williams Sound PPA R37-8N FM receiver features easy-to-use, 8 channel rotary selection knob with access to 8 pre-set wideband frequencies between 72-76 MHz. Compatible with the following Williams Sound transmitters: PPA T45, PPA T46, and PPA T27. Digitally synthesized for even greater audio clarity and stability. A versatile 3.5mm stereo/mono jack allows for a variety of earphone and headphone options, and is neckloop/telecoil-equipped-hearing-aid compatible.