Koss QZ99 Passive Noise Reduction Headphones

SB40 20Hz Communication Stereophone with Microphone

Koss Part# SB40

Headset/Earsets – Headset - Over-the-head - Binaural - 20 Hz Minimum Frequency Response - 20 kHz Maximum Frequency Response - Boom - Black - Wired - Ear-cup - Stereo - Mini-phone (3.5mm) - 9 ft Cable Length - Gold ...