Optoma NuForce Primo8 Quad-Driver Earphones with World's First Phase-Coherent Crossover Design In-Ear Audiophile-Quality Speaker System: Four balanced-armature drivers in each earphone deliver a smooth, extended response, explosive dynamic realism and fatigue-free sound. Connectivity Technology : Wired Ideal Balance and Accuracy: A three-way phase-coherent crossover design achieves perfect linear phase performance resulting in a natural, fully dimensional soundstage, lightning-fast transients and crystalline transparency Proprietary cable design utilizes two layers of star-pattern wires (Kevlar Silk, silver and OFC copper wires) with ground-breaking technologies to achieve incredibly accurate sound reproduction Breathtaking Realism: A captivating midrange and delicate highs envelop the listener in musical textures almost real enough to touch; and, with two bass speakers working in tandem, the listener experiences the purest, most natural bass possible What's in the Box: 2 pairs of Comply Isolation foam ear tips (M, L), 8 pairs of silicone ear tips (S, M, L, XL), 51.2in (130cm) detachable cable with microphone, 3.5mm to 6.5mm adapter, Primo8 leather pouch, cleaning tool and microfiber cleaning cloth