A 4K USB-C to HDMI extender (transmitter + receiver) transmits high-definition audio/video from USB-C laptops/phones to HDMI displays over Cat6/7 cable up to 100–400+ feet. Supporting up to 4K or 120Hz, these kits are ideal for digital signage, boardrooms, and home entertainment, often featuring IR/USB pass-through for remote control and, in some cases, power-over-cable