Combining a 10mm LF driver & a 5.5mm neodymium MF/HF driver, KEF’s unique Dual Dynamic Driver (DDD) array creates an immaculately detailed & engagingly natural sound right across the frequency range, with the LF chamber connected to the light aluminium housing for tight, resonance-free bass. KEF’s discreet, flexible Secure Arm folds neatly to the shape of your ear to hold each earpiece in place, even when you’re moving around. Together with an ergonomic shell & soft silicone tips that fit snugly over the ear canal to form a tight acoustic seal that eliminates external noise, they feel so natural that you soon forget you’re wearing them. Compatible with most smartphones, computers & other mobile devices, the M200 has an in-line microphone & remote control for iPhone & other Apple products, allowing you to operate the play functions or switch between calls & music. With the flight adapter provided, it’s the ideal travelling companion.