Telex Model WT-1000 Transmitter Features 
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* Power ON/OFF switch

* Audio gain adjustment with 40 dB range

* Transmit power switch 

* Microphone/instrument switch (0, -20 dB)

* Menu, set, up, down buttons

* Red LED low batter indicator

* LCD display (channel/group, frequency, battery level)

* 8 hours with a 9V alkaline (typical)

* External 1/4-wave antenna, detachable

* TA4M input for microphone

   Pin 1: Ground
   Pin 2; Mic Input
   Pin 3: +5V Bias
   Pin 4: +5V through 3k ohm

* RF output - normal, 5 mW (typical)

* RF output - high, 50 mW (typical) 

* Case material is cast magnesium 

* Dimensions: (WxHxD) 4.4" x 2.6" x 0.9"

The Telex WT-1000 body pack transmitter is intended for use with the Telex
FMR-1000 series wireless microphone system. The rugged, light weight
transmitter features a TA4 input connector for adapting Telex and Electro-Voice
lavaliers, headset microphones and instrument cables terminated with a TA4
connection. The WT-1000 is capable of accepting microphone or line level signal
and a comprehensive LCD provides channel, group and battery level information.
The WT-1000 is powered up to 8 hours on a single 9-Volt battery.