Comes with a 2.5mm mini-jack for use with RS-600-series and HelixNet beltpacks ONLY.
Specifications
Single or Double Ear Headset: Single Open or Enclosed Ear Phone: Open Weight: 25g Earpads Foam or Leatherette: Foam Type of Microphone: Electret Impedance Mic/Earpiece: 2200ohms/32ohms