MODEL- ACM-900RB VENDOR- CYBER ACOUSTICS FEATURES- Pro Series Stereo Headphone- Black OEM Pack Stereo headphone with adjustable headband soft leatherette earpads and in-line volume control. 9 foot shielded cord with 3.5mm stereo plug and 6.3mm adapter. -- SPECIFICATIONs ----------------------------------DRIVERS - 40mm dynamic driversIMPEDANCE - 32 ohmsFREQUENCY RESPONSE- 20