Sennheiser HMD280-XQ-2 Dual-Ear Closed Headphones with Supercardioid Dynamic Boom Microphone, 9.9 FT 502714 Sennheiser HMD 280-XQ Dual-Ear Closed Headset with Supercardioid Dynamic Boom Microphone - Sennheiser 2 Year Limited Warranty Headset Type: Around-Ear, Closed-Back, Dynamic Frequency Range: 8Hz-25kHz Microphone Type: Supercardioid, Dynamic Mic Frequency Response: 50Hz-13kHz