The Pearstone HDMI Female to HDMI Female Coupler connects two male-end cables to extend the total length of the HDMI signal. The coupler supports ultra-fast HDMI speeds, and supports advanced features such as: Audio Return Channel, 3D content, and ultra-high resolution of 4K. It is also ready for use as part of an HDMI over Ethernet network.

The coupler features 24k gold-plated connectors, for cleaner transmission and corrosion resistance. The all-metal casing is finished in a stylish high-glossy black, which makes it ideal for use as part of a home-theater system.

https://www.bhphotovideo.com/c/product/751020-REG/Pearstone_hd_afss_HDMI_to_Mini_HDMI.html/overview