The MH751 by CoolerMaster is a 2.0 Stereo channel gaming headset, which uses a 40mm Neodymium driver. It uses a 3.5mm 4-pole jack connection with a 1.5m, 0.3m Splitter cable. This delivers a frequency response of 20 - 20,000Hz and a sensitivity of 97dB +/- 3 dB. It also has a Detachable, Omni-directional microphone with a frequency response of 100 - 10,000Hz and sensitivity of -42 +/- 3dB. And only weighs in at 280g.
The MasterPulse MH750 by CoolerMaster, which uses a 44mm driver driver. It uses a USB, Gold Plated connection with a 2m cable. This delivers a frequency response of 20 ~ 20,000Hz and a sensitivity of 118 dB +/-3 dB. It also has a Uni-Directional microphone with a frequency response of 100 ~ 10,000Hz and a sensitivity of -34 +/-3dB.