System includes one ST-300 transmitter, four SR-50 receivers, four SEB-1 earbuds, antenna, power supply and ADA wall plaque.  Unlimited additional receivers may be added at any time. (Batteries not included) 
 

 The SR-50 single channel receiver provides clear reception and the simplicity of a fixed channel. This economical receiver operates on one of 17 fixed narrow-band frequencies in the 72-76 MHz band. Ergonomic raised volume control knob make level adjustments easily accessible by feel. Recessed headphone jack provides extra protection for earphone connections. Two AA batteries give up to 30 hours continuous battery life. (Earphone and batteries not included)
 

The SR-400 16 channel receiver features an advanced digital PLL synthesizer to tune all 17 narrow-band frequencies offered in the 72-76 MHz band. Features include a backlit LCD channel display, low battery indicator, and compatibility with the E.D.R. feature in the ST-300 and PST-170 transmitters for improved sound quality. The receiver also includes a special high frequency contour filter and boost switch to increase the intelligibility of the audio signal. Additional features include a battery saving automatic power shutoff when the earphone is unplugged. (Earphone and batteries not included)
 

The ST-300 base transmitter features 17 user selectable frequencies controlled by a front mounted control buttons and LCD display, a headphone jack with adjustable level for input signal monitoring, and a peak reading on the LCD display for visual input monitoring. On the back of the unit is a balanced XLR-3F with selectable mic, line, and 70 volt input options, as well as an unbalanced 1/4" input. The input selection and attenuation is all done from the controls on the front panel.
 

The PST-170 belt pack transmitter may be set to any one of the 17 channels, and operates on frequencies in the 72-76 MHz band. It is lightweight, battery operated and includes a small electret lapel microphone for convenient portable use. The PST-170 has two audio input jacks. The Auxiliary input is designed to allow audio devices such as teacher's aids or tape players. The second jack is normally used for microphone and is located on the top panel. The channel is displayed on a backlit LCD and can be locked to prevent accidental changes. (Batteries not included)
 

For use with SR-50, PPA-R37N or SR-400

For use with SR-50, PPA-R37N or SR-400

Williams EAR-014
Dual Earbud

(Bonus!  Includes 2 extra foam covers)

For use with SR-50, PPA-R37N or SR-400

Package of 12 replacement foam covers
for SEB-1 or DEB-2 earbuds

Package of 100 replacement foam covers
for SEB-1 or DEB-2 earbud

For use with SR-50, PPA-R37N or SR-400

For use with SR-50, PPA-R37N or SR-400

Telex HED-2
Lightweight
Collapsible Headphone

For use with SR-50, PPA-R37N or SR-400

For use with SR-50, PPA-R37N or SR-400

Inductive Neckloop with cord for use with hearing aids equipped with telecoils.

For use with SR-50, PPA-R37N or SR-400

Inductive Neckloop with cord for use with hearing aids equipped with telecoils.