Williams Sound PPA T46 Personal PA Body-pack Transmitter, Black/Silver, 1.25" OLED interface displays (master & aux volume level, mic mute, settings lock, battery level), Easy-to-use menu-access controls, 17-channel selectable 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 Sleek, ergonomic design 17-channel selectable, 72-76MHz Digitally synthesized frequencies 1.25" OLED interface displays (master & aux volume level, mic mute, settings lock, battery level) Easy-to-use menu-access controls MIC input accepts electret mic with 3.5mm mono plug AUX audio input accepts 2.5mm stereo plug (i.e for MP3/CD player) Range of up to 150' (with PPA R37 receiver) FCC Part 15 compliant Belt clip for hands-free operation Meets ADA guidelines Made in the USA Includes: PPA T46 Transmitter, BAT 001-2 (2) AA Batteries, CLP 023 Belt Clip and WCA 087 Auxiliary Input Cable Specifications Dimensions: 4.1"x2.8"x1.1" Weight: 2.6 oz, no batteries Stability: ? .005%, frequency synthesized, crystal reference, PLL Modulation: Wide-band FM, 75kHz peak, 75?S pre-emphasis RF Output: 80mV/m at 3m Frequency Response: 180Hz to 13kHz, ?3dB at 1% max. THD Signal-to-Noise Ratio: 65dB (typical) transmitted Aux Input: 2.5mm stereo jack, adjustable gain with 60dB range Audio Compression: 1:1 (off)/2:1 (on) selectable in menu