Welcome to the store! 1. Industrial HUB Chip: Featuring MTT technology, 4 simultaneous USB connections are stable and reliable. 2. ESD Protection: Each USB port is equipped with ESD protection to prevent surge damage and data loss. Overvoltage protection effectively shields connected equipment from high-voltage power supplies. 3. Multiple Protection Circuits: Includes overvoltage, overcurrent, short circuit, over-temperature, reverse current, undervoltage shutdown, 8KV ESD protection, filter protection, and more. 4. LED Indicator: An LED indicator monitors the power supply and USB port operating status. 5. Industrial Metal Casing: Robust and durable, with mounting holes for easy installation. 4 extended USB ports, compatible with USB 2.0 / 1.1. Item Type: Expansion Hub Adapter Material: Metal Interface Standard: USB 2.0 Communication Speed: Theoretically up to 480 Mbps Input: 100V-240V USB HUB Input: Working Voltage: 5V Interface Form: USB-B USB Output: Working Voltage: 5V at Imax: 1.2A (Each USB interface can output a maximum of 1.2A with sufficient input power) Interface Form: USB-A External Power Supply: Power Supply Voltage: DC 5V (Supports 5V 2A power supply; for heavy USB device loads, a 5V 4A power supply is recommended) Interface Form: DC Power Supply Jack Operating Environment: -40℃ - 85℃ Operating System: Supports OS (8.6 or higher), Linux (2.4.20 or higher), Windows 11/10 / 8.1 / 8/7 / XP Product Size: Approx. 47.8mm / 1.9in, 44.8mm / 1.8in, 86mm / 3.4in, 72.2mm / 2.8in, 3.6mm / 0.1in, 10mm / 0.4in, 2.1mm / 0.08in, 27.6mm / 1.1in 1 x USB-HUB-4U 1 x USB Cable 1 x 5V 2A US Power Supply Your satisfaction is our top priority. We are committed to providing you with the best service. If you encounter any issues after receiving the product, such as damage or incorrect quantity, please contact us immediately for the best solution!