JBL Go 4 Ultra Portable, Waterproof and Dustproof Bluetooth Speaker Blue size__8 25 mm digital tolerance tells Not to forget it 25 mm digital tolerance tells you exactly where your pen is on screen The ATH A990Z art monitor closed back dynamic headphones feature proprietary large aperture 53 mm drivers with OFC bobbin wound voice coils to deliver Hi Res audio reproduction The drivers' integrated yoke and top mounted PCB contribute to the high resolution performance by providing superior transient response and smoother airflow for precise diaphragm movement The lightweight aluminum housings reduce unwanted resonance and incorporate Audio Technica's double Air damping system (D A D S) for Deep bass reproduction A t's improved 3D wing support system ensures a great comfortable fit aided by the headphones' soft premium grade ear pads The 3 0 M (9 8') tangle free cable is cloth wrapped for lasting durability loud JBL Pro Sound with rich And up to 7 hours of playtime mean it will keep the good times rolling throughout a fun day trip or an evening chilling under the stars