An HDMI extender transmits high-definition audio and video signals beyond the limited range of a standard HDMI cable, typically by using Ethernet or wireless technology. Wired extenders use a single Cat5e/Cat6 cable to run signals up to 120 meters or more, while wireless versions transmit signals without any cables. They are commonly used in home theaters, digital signage, and video conferencing for long-distance connections.This HDMI extender allows you to connect two devices up to 40 meters with Cat.6 /6A/7 cable. Lightness and convenience, combined with the small size.