GENUINE and ORIGINAL Packing same as Pictures. Provide Tracking Number Was blessed with features of both the casual design and robust sense , closed-type stereo headphones of street design . And counter-rotating one ear monitor mechanism to reverse the housing , I adopt the convenient folding headband for the storing and carrying. A sound release hole for controlling the movement of the diaphragm , by improving the properties of the acoustic filters are formed by nonwoven fabric to balance the front and rear of the diaphragm , and play a rich bass . Because by using the material force is high in driver unit section , speaker magnetic force to issue a sound is strong , you can play a rich sound quality from bass to treble Part Number RP-HB400 Model Sealed dynamic stereo headphone 40mm diameter driver unit Impedance 32Ω Sound pressure sensitivity 102dB/mW 1,000 mW maximum input (IEC: International Electrotechnical Commission ) 10 ~ 27,000 Hz frequency band playing About 1.2m length of the cord Type stereo mini plug of the plug ( diameter 3.5mm, straight type , 24K gold-plated ) About 160g mass about 135g / ( including code ) (excluding code )