This product is a 4K@60Hz HDMI™ optical extender kit consisting of a transmitter and a receiver, using IP colour STREAM technology for high-definition, low-latency transmission. The 4k@60Hz HDMI™ signal can be extended up to 40km by LC single-mode fibre cable, supporting one-to-one connection, one-to-many connections via a gigabit switch or switch cascades. It also supports HDMI™ loop out, IR passback, and RS-232 pass-through functions and can be widely used in meetings, home entertainment, educational presentations, and other fields.