. Sound meets style with smartphone playback controls for life on the go. More than your basic pair of over-the-head headphones the Sony MDR-ZX310 headset delivers rock-solid audio performance integrated microphone for hands-free calling & media playback controls for convenient operation. Key Product Info. 30 mm dynamic driver unit On-ear headband Four-conductor gold-plated L-shaped stereo mini plug. Smartphone playback control The integrated microphone & multi-function control button make the the MDR-ZX310 the perfect companion for your smartphone. Quality sound The large driver units coupled with ferrite magnets will accurately reproduce a broad dynamic frequency range. You'll enjoy smooth transitions in treble & mid-range frequencies with powerful bass response. Pressure relieving earpads The lightweight adjustable headband with swivel ear pads is designed for comfort so you can enjoy extended listening sessions without fatigue. Swivel earcups The slim swivel & folding style earcups stow away for compact portability..