Kramer EXT3-U-KIT USB 2.0 PoC Extender Up to 330 Feet with Audio RS-232 SupportExtend USB 2. 0, RS 232, and audio signals up to 330 feet with the Kramer EXT3 U KIT. Designed for meeting rooms, classrooms, and corporate environments, this all in one kit includes a transmitter and receiver that convert USB and audio signals over a single Cat 6a cable for seamless connectivity and power. Connect up to four USB peripherals: keyboards, mice, headphones, or smartphones, and enjoy smooth, plug and play performance without complicated