Interphone headset, Sikadeer Handsfree Two-way Radio Headphone,Two Way Radio Earpiece, Transparent Security Intercom Headsets with PTT/VOX - Pair Interphone headset for more convenient trip or business. Two Way Radio: A transparent ear microphone with a behind-the-ear design. Ideal handsfree Interphone for security business; Fits directly into the ears; Two-way Radio Headphone with push-to-talk and vox options . Intercom Headset matched with various types of two-way radio simply, such as midland.