This is for a Lot of 5, Preowned and in good shape 

Egghead EGG-IAG-1003-SO Switchable Stereo/Mono Volume Adjustable Headphones

• FEATURES: Angled plug to reduce accidental pull-out / 3.5 mm plug compatible with Mac and PC ; Coiled Cord
• SPECIFICATIONS: Audio Output: Stereo & Mono / Impedance: 32 Ohms +/- 15% at 1Khz /Frequency Response: 20 Hz 20,000 Hz/ Speaker Drivers: Two 40mm ferrite stereo speakers
• SOUND: Listen in either Mono or Stereo Modes, just flip the switch to alternate between the two
• VOLUME CONTROL: Individual volume controls on each ear cup allows for precise sound level adjustment
• COMFORTABLE FIT: Padded ear cushions and a cushioned, adjustable headband to accommodate users head