Plantronics 27019-03

Y-Training Cord - Y Cable - Y-Splitter Cord - Y Splitter Cable
Plantronics H-Series & P-Series Headsets
$39.95 from an Authorized Plantronics Distributor

The Plantronics Y-Training cord / Y-Splitter cable allows two headsets to operate with one amplifier for training/monitoring purposes.  Both headsets can listen, but only one headset will have a live microphone.  The other microphone is muted.  The red toggle switch allows the supervisor to control which microphone is live and which is muted.