3.5mm keyed/collared female to 3.5mm male Headset Adapter Cable (3.5mm jack). Required for use with headsets that use a locking keyed connector on the headset jack (i.e. HDST-35MM-PTVP-01). Includes Retention/Anti-Rotation Lock (ADP-LOCK-3.5HT1-01) (Zebra CBL-TC51-HDST35-01)