Pls note: 2 options: with USB Port, or Without USB Port, pls buy it correctly as you need Fiber optic high-definition transmission, better picture quality, up to 1920x1080p resolution contrast. High-quality chip modules provide high-quality electrical characteristics and make data transmission more stable. Single-core optical fiber transmission, hardware design, no need to drive, compatible with more systems, plug and play. The metal material is sturdy and durable, has excellent anti-interference performance, can adapt to various interference environments, and has higher safety performance. Free application of various scenes, widely used in monitoring rooms, video conferences, multimedia classrooms and other places. Product Parameters: Input resolution: 480p, 576p, 720p, 1080i, 1080p@60fps Input Sampling rate: 32KHz, 44.1KHz, 48KHz Red control frequency: 38KHz HDMI/HDCP: HDMI 1.3/HDCP1.2 Fiber interface: single fiber single mode, SC interface Power supply: DC: 5V/2A Ambient temperature/humidity: 0 Celsius-70 Celsius/10%-80%RH (no doubt knot) Storage temperature/humidity: -10 Celsius-80C/5%-90%RH (no doubt knot) Colour: black Material: metal Package Contents: 1 * 20km HDMI Fiber Extender Receiver (with USB or not ,as you choose) 1 * 20km HDMI Fiber Extender Transmitter (with USB or not ,as you choose) 2 * Power adapter