The PPA T46 transmitter will broadcast a speaker's voice or audio program on one of 17 available channels, 72-76 MHz, to listeners using PPA R38 or PPA R37 receivers. The unit features flexible microphone and auxiliary input jacks, push-button on/off/mute controls, channel lock and selectable compression. The PPA T46 operates up to 30 hours on two (2) AA Alkaline batteries, and up to 20 hours with two (2) NiMH batteries. Key Features