Check the listing for details. Zoom Zms-trainer Training Adapter Switch For He (zmstrainer). Color: black, Condition: New. Listed at 35.00 USD. The Zoom ZMS-Trainer Training Adapter Switch for HE (ZMSTRAINER) is a black telephone headset designed for use in business and industrial settings. This adapter switch, specifically designed by Zoom, provides connectivity for telephone headsets and offers a convenient training option for users. The ZMSTRAINER model is compatible with none of the major brands, making it a versatile choice for various telecom systems in an office setting.