1Industrial Grade HUB Chip: Using MTT technology, 4 concurrent USB connections are stable and affluent. 2ESD Protection: ESD protection for each USB port to prevent surge damage and data loss. Overvoltage protection effectively prevents other high voltage power inputs from damaging the connected equipment. 3Multiple Protection Circuits: Over voltage, over current, short circuit, over temperature, reverse current, under voltage lockout, 8KV ESD protection, filter protection, etc. 4LED Indicator: LED indicator used to monitor the power supply and the operating status of the USB port. 5Industrial Grade Metal Housing: Sturdy and durable, with mounting holes for easy installation. 4x extended USB ports, compatible with USB 2.0 / 1.1. Item Type:Expansion Hub Adapter Material: Metal Interface Standard: USB 2.0 Communication Rate: Theoretically Up to 480 Mbps Plug: 100V-240V USB HUB Input: Working Voltage: 5V Interface Form: USB-B USB Output: Working Voltage: 5V at Imax: 1.2A (When the Input Power is Large Enough, Each USB Interface Can Output 1.2A Maximum) Interface Form: USB-A External Power Supply: Power Supply Voltage: DC 5V (Supporting 5V 2A Power Supply, If the Load of the USB Device is Heavy, It is Recommended to Replace the 5V 4A Power Supply) Interface Form: DC Power Supply Terminal Use Environment: -40 - 85 Operating System: Support for OS (8.6 or Above), for Linux (2.4.20 or Above), for 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