Snap-on Audio Adapter (3.5mm jack) with Retention and Anti-Rotation Lock/Clip. Works w/hand strap. Full access to battery. Kit includes Snap-on 3.5mm Adapter (ADP-TC7X-AUD35-01) and Retention/Anti-Rotation Lock (ADP-LOCK-3.5HT1-01). (Zebra KIT-TC7X-AUDL35-01)