Williams AV PPA VP 37 Personal PA Value Pack Assistive Listening System With 4 Earbuds (72 to 76 MHz)The PPA VP 37 Personal PA Value Pack System from Williams Sound broadcasts a speaker's voice, music program, or audio service wirelessly (up to 500') to a listening audience. This system includes a PPA T27 transmitter, four Select PPA (R37) receivers with AA batteries, four mini earbuds, two neckloops, a wall plaque, an audio cable, an antenna, and a power supply. Participants use the receivers, with a headset plugged in, to listen to the broadcast