TESLUNE HDMI cable enhancer upgrade your HDMI cable bandwidth up to 18Gbps. As long as your HDMI cable supports 1080P, 720P or even 480P, this HDMI cable enhancer can make your cable support 4K@60HZ without change the HDMI cord. This HDMI cable booster is perfect for some situation which is inconvenient to replace existing HDMI cable especially when the cable is built in-wall.