Engineered using high performance 40mm drivers that deliver balanced sound with rich bass and pristine vocals , Lightweight , low profile folding design is perfect for an active lifestyle or frequent travel.Designed and crafted using superior materials and components that deliver a distinct look and enhanced durability. Soft touch cushions ensure comfort during extended wear and an acoustic seat for blocking ambient noise. *** TECHNICAL DATA *** Plug type : 3.5 mm gold – plated stereo Driver Diameter : 40 mm Sensitivity : 114 dB Frequency response : 20 – 20,000 Hz Input impedance : 32 Ohms Cord length : 48 cm ( plus 79 cm extension cable )