The APU-76 Electronic Hook Switch- communicates electronically with the phone, eliminating the need for a conventional mechanical HL10 lifter.

The EHS adapter is unique to a specific Telephone application & Wireless product
APU-76 is designed for Plantronics Wireless CS500 series and Legend CS Mitel products.

Supported Phones 
PC/USB Softphone, Mitel 6867 / 6869