Shokz OpenRun Pro 2 Standard Headset Boston Marathon. With DRC technology and two specialized mics for clear calls these sport headphones offer killer sound while keeping you connected to your surroundings. Open-Ear Audio Rewritten Shokz rewrites the rules of open-ear audio with DualPitch. This innovative technology combines bone conduction for precise mids and highs with a dedicated air conduction speaker for controlled deep bass. Bone Conduction Driver for Clear Highs The high-sensitivity and rigidity bone conduction driver is made entirely from ultrathin metal for clearer highs and full natural mids. The innovative dual reeds and coils design provides a more stable vibration system for a purer vocal sound. The upgraded diaphragm is strengthened and dome shaped for greater amplitude without sacrificing audio balance. The patterned polymer surround enhances the subtlest details. And with 18x11mm air conduction drivers you get a more booming deep bass response. 3D Audio Perfection Forget flat audio and muddled frequencies OpenRun Pro 2's custom algorithm assigns each sound element to a dedicated driver crafting a balanced dynamic and immersive 3D soundscape. To ensure every note rings true DRC technology silences distortion even at peak volume. Specifications for Shokz OpenRun Pro 2 Standard Headset: Manufacturer: Shokz Color: Boston Marathon Headset Type: Fixed Battery Type: Lithium Ion Package Contents: Shokz OpenRun Pro 2 Standard Headset Case Charging Cord Shokz S820-ST-BM-US-326: OpenRun Pro 2 Standard Headset Boston Marathon