The ICC 4K HDMI Keystone Jack is engineered for high-definition audio and video performance, featuring gold-plated connectors that enhance signal transfer and resist corrosion, alongside 99% oxygen-free copper conductors to deliver robust and clear transmission with minimal loss. Copper foil shielding further mitigates interference, safeguarding the signal from external noise. These keystone jacks are compatible with HDMI v1.2, v1.3, and v1.4, supporting formats such as 720p, 1080i, 1080p, 3D, and HDCP, making them versatile for various devices. Designed for easy snap-in installation, they fit standard keystone faceplates, inserts, and surface mount boxes, providing flexibility in home theater and entertainment setups. With support for 4K Ultra HD video at 60Hz as per HDMI 2.0 standards, these commercial-grade keystone jacks are ideal for delivering a high-quality viewing experience. The sturdy female-to-female HDMI 2.0 coupler ensures a secure connection and fits vertically oriented keystone openings in wall plates or patch panels (sold separately). Quick-connect installation with reusable keystone jack inserts allows for easy disconnection and relocation during upgrades or redecorations. This cost-effective 25-pack offers HDMI inserts for connecting video sources and HDTVs with cables concealed behind the wall for a seamless installation, whether upgrading existing keystone jacks to 4K or adding new connections. Constructed with ABS housing, brass IDC with 100 micro-inch of tin, and gold-over-nickel-plated copper alloy terminals, these connectors operate reliably in temperatures ranging from -10°C to 60°C and can be stored in temperatures from -40°C to 70°C with non-condensing humidity of 93%, ensuring both durability and top-tier performance.