Superb studio monitor sound quality made affordable The Edifier H840 headphones are the must-haves for entry-level audiophiles. The sound is simply pure and clear. These headphones are engineered with electro-acoustic technology that gives you the most life-like audio quality. Featured with simple, classic yet elegant style, exquisite material and workmanship, the H840s provide you with very comfortable wearing and listening experience. Technical Specifications Driver Unit: 40mm NdFeB magnetic unit Impedance: 32Ohm - Frequency Response: 20Hz-20KHz Sound Pressure Level (SPL): 98dB Connector: 3.5mm stereo gold-plated plug Cable: 2m TPE Y shape cable Weight: 200g net Buy with confidence from world's second largest manufacturer. Edifier is the world's second largest consumer audio manufacturer. Despite not well-known in the US, Edifier has great market shares in Asia, Europe and South America. Edifier is the parental company of STAX, one of the most expensive headphone brands in the world. Edifier has incorporated similar technology and design concept into its consumer earphones and headphones, and strives to make the best sound affordable to everyone.