What Is the USB-EX165-K?
The OREI USB-EX165-K is a USB 2.0 extender kit that extends USB signals up to 50m / 164ft over CAT5e / CAT6 cable.
The kit includes a Transmitter and Receiver. The Transmitter connects to a computer using the included USB-B to USB-A cable, the Receiver connects to USB devices such as a printer or USB flash drive, and a CAT5e / CAT6 cable connects the Transmitter to the Receiver.
The USB-EX165-K supports USB 2.0 protocol, data transmission speeds up to 480Mbps, two USB 2.0 output ports on the Receiver, plug-and-play setup with no driver installation, and extension distance up to 50m / 164ft over CAT5e / CAT6 cable. The manual notes that transmission distance may be limited to 40m / 131.2ft for some USB 2.0 hubs.
The USB-EX165-K is useful for extending USB devices away from a computer in classrooms, conference rooms, offices, control rooms, printer setups, USB peripheral setups, and installations where USB devices need to be placed farther from the host computer.
IMPORTANT — USB-EX165-K Extends USB Only
The USB-EX165-K is a USB extender.
It does not extend:
- HDMI video
- DisplayPort video
- Audio
- Ethernet network
- IR control
- RS-232
- KVM video switching
It is designed to extend USB 2.0 data between a computer and USB devices.
IMPORTANT — Supports USB 2.0 up to 480Mbps
The USB-EX165-K supports USB 2.0 protocol with transmission rate up to 480Mbps.
This is suitable for USB 2.0 devices such as:
- Printers
- USB flash drives
- Keyboards
- Mice
- USB control devices
- Basic USB peripherals
It is not a USB 3.0 extender. USB 3.0 devices may work only at USB 2.0 speed if they are backward compatible.
IMPORTANT — Extends up to 50m / 164ft
The USB-EX165-K extends USB signals up to 50m / 164ft over CAT5e / CAT6 cable.
| Cable Type | Maximum Distance |
| CAT5e / CAT6 | Up to 50m / 164ft |
| Some USB 2.0 hub setups | Up to 40m / 131.2ft |
For best performance, use high-quality CAT5e / CAT6 cable.
Poor cable quality, damaged connectors, or bad terminations may cause USB devices not to detect or disconnect intermittently.
IMPORTANT — Receiver Has Two USB 2.0 Ports
The Receiver includes two USB-A 2.0 ports.
These ports can connect USB devices such as:
- Printer
- USB flash drive
- Keyboard
- Mouse
- USB control device
- Other USB 2.0 peripheral
The manual’s application example shows a printer and U disk connected to the Receiver side.
IMPORTANT — Receiver Requires Power
The Receiver must be powered using the included 5V/1A power adapter.
| Unit | Power Method |
| Transmitter | Powered by the computer through USB-B connection |
| Receiver | Powered by included DC 5V/1A adapter |
If the Receiver power LED does not light, check the 5V/1A adapter, outlet, and DC 5V connection.
IMPORTANT — Transmitter Connects to the Computer
The Transmitter has one USB-B port.
Use the included USB-B male to USB-A male cable to connect the Transmitter to the computer.
The computer controls the USB devices connected to the Receiver.
IMPORTANT — Plug and Play
The USB-EX165-K is plug and play.
The manual states that no driver or setting installation is required.
If a USB device is not detected, reconnect the USB device, check the CAT cable, confirm Receiver power, and test the USB device directly with the computer.
Ports and Panel Layout
| Port / Indicator | Unit | Function |
| USB-B Port | Transmitter | Connect to computer USB port using USB-B to USB-A cable |
| Power LED | Transmitter | Green LED lights when Transmitter receives power from the computer |
| CAT Port | Transmitter | Connect CAT5e / CAT6 cable to Receiver CAT port |
| USB 2.0 Ports | Receiver | Connect USB devices such as printer or USB flash drive |
| Power LED | Receiver | Green LED lights when Receiver is powered |
| DC 5V | Receiver | Connect included 5V/1A power adapter |
| CAT Port | Receiver | Connect CAT5e / CAT6 cable from Transmitter |
Step-by-Step Setup
- Connect the included USB-B to USB-A cable from the Transmitter USB-B port to the computer USB port.
- Connect CAT5e / CAT6 cable from the Transmitter CAT port to the Receiver CAT port.
- Connect the included 5V/1A power adapter to the Receiver DC 5V port.
- Connect USB devices to the Receiver USB 2.0 ports.
- Wait for the computer to detect the connected USB devices.
- Test the USB device function from the computer.
CAT Cable Requirement — Critical
Use high-quality CAT5e / CAT6 cable.
| Requirement | Recommendation |
| Cable type | CAT5e / CAT6 |
| Maximum distance | Up to 50m / 164ft |
| Some USB hub setups | Up to 40m / 131.2ft |
Poor CAT cable may cause:
- USB device not detected
- Printer not responding
- USB flash drive disconnecting
- Slow transfer
- Intermittent USB connection
- Receiver not communicating with Transmitter
Use a direct CAT cable connection between the Transmitter and Receiver.
USB Cable Requirement — Critical
Use the included USB-B to USB-A cable to connect the Transmitter to the computer.
Poor USB cable quality may cause:
- Transmitter not powering on
- USB device not detected
- Intermittent USB connection
- Slow data transfer
For troubleshooting, try a different USB port on the computer.
Power Requirement — Critical
The Receiver requires DC 5V/1A power.
| Unit | Power Requirement |
| Transmitter | Powered by computer USB port |
| Receiver | DC 5V/1A power adapter |
If the Receiver is not powered, the USB devices connected to the Receiver will not work.
Understanding the Transmitter
The Transmitter is installed near the computer.
It has:
- USB-B input
- CAT output
- Power LED
The Transmitter takes USB data from the computer and sends it over CAT5e / CAT6 cable to the Receiver.
Understanding the Receiver
The Receiver is installed near the USB devices.
It has:
- CAT input
- Two USB 2.0 output ports
- DC 5V power input
- Power LED
The Receiver outputs USB 2.0 ports for USB devices such as printers, flash drives, keyboards, and mice.
Understanding the Application Example
The application diagram shows:
| Location | Connection |
| Computer side | PC connected to Transmitter through USB |
| Cable run | Transmitter connected to Receiver using CAT5e / CAT6 |
| Device side | Receiver connected to printer and U disk |
| Power | Receiver powered by DC 5V adapter |
This means the PC can control USB devices connected at the Receiver side.
Supported Technical Specifications
| Specification | Support |
| Product Type | USB 2.0 extender over CAT5e / CAT6 |
| USB Protocol | USB 2.0 |
| Transmission Rate | Up to 480Mbps |
| Transmission Distance | Up to 50m / 164ft |
| USB Hub Distance Note | Up to 40m / 131.2ft for some USB 2.0 hubs |
| Transmitter Input | 1 x USB-B female |
| Transmitter Output | 1 x CAT RJ45 female |
| Receiver Input | 1 x CAT RJ45 female |
| Receiver Output | 2 x USB-A female |
| Power Supply | DC 5V/1A |
| Power Consumption | Transmitter 0.7W, Receiver 1W |
| Housing | Metal enclosure |
| Color | Black |
| Dimensions | 82mm x 49mm x 20mm |
| Weight | Transmitter / Receiver: 100g |
| Operating Temperature | 0°C to 40°C / 32°F to 104°F |
| Storage Temperature | -20°C to 60°C / -4°F to 140°F |
| Relative Humidity | 20–90% RH, non-condensing |
| ESD Protection | ±8kV air-gap, ±4kV contact |
What Computers Is the USB-EX165-K Compatible With?
The USB-EX165-K can connect to computers with a USB-A port, including:
- Desktop PCs
- Laptops
- Workstations
- Control room computers
- Office computers
- Classroom computers
The Transmitter connects to the computer using the included USB-B to USB-A cable.
What USB Devices Is the USB-EX165-K Compatible With?
The USB-EX165-K can connect to USB 2.0 devices such as:
- Printers
- USB flash drives
- Keyboards
- Mice
- USB control devices
- Basic USB peripherals
High-power USB devices may require their own power supply or a powered USB hub.
Frequently Asked Questions
Q: What is the OREI USB-EX165-K used for?
A: The USB-EX165-K is used to extend USB 2.0 devices up to 50m / 164ft away from a computer over CAT5e / CAT6 cable.
Q: Does the USB-EX165-K support USB 2.0?
A: Yes. It supports USB 2.0 protocol.
Q: What is the maximum data rate?
A: It supports transmission rate up to 480Mbps.
Q: Does it support USB 3.0?
A: No. It is a USB 2.0 extender.
Q: How far can it extend USB?
A: It can extend USB up to 50m / 164ft over CAT5e / CAT6 cable.
Q: Why does the manual mention 40m for some USB hubs?
A: Some USB 2.0 hubs may only work up to 40m / 131.2ft, depending on the hub and setup.
Q: What CAT cable should I use?
A: Use high-quality CAT5e or CAT6 cable.
Q: Does it work through a network switch?
A: No. Connect the Transmitter and Receiver directly with CAT5e / CAT6 cable.
Q: Does it extend HDMI video?
A: No. This model extends USB only.
Q: Does it support audio?
A: No. It does not list audio support.
Q: How many USB ports are on the Receiver?
A: The Receiver has two USB 2.0 ports.
Q: What connects to the Transmitter?
A: The Transmitter connects to the computer using the included USB-B to USB-A cable.
Q: What connects to the Receiver?
A: USB devices such as a printer, USB flash drive, keyboard, or mouse connect to the Receiver.
Q: Does the Transmitter need a power adapter?
A: No. The Transmitter is powered by the computer through the USB-B connection.
Q: Does the Receiver need a power adapter?
A: Yes. Connect the included DC 5V/1A power adapter to the Receiver.
Q: Is driver installation required?
A: No. The manual states it is plug and play with no driver or setting installation required.
Q: Can I connect a printer?
A: Yes. The manual lists printer use and shows a printer in the application example.
Q: Can I connect a USB flash drive?
A: Yes. The manual shows a U disk connected to the Receiver.
Q: Can I connect a keyboard and mouse?
A: Yes, keyboard and mouse are typical USB 2.0 devices and can be used if they are compatible with the computer.
Q: What should I do if the USB device is not detected?
A: Check Receiver power, CAT cable connection, USB cable connection to the computer, and test the USB device directly with the computer.
Q: What should I do if the Receiver power LED is off?
A: Check the DC 5V/1A power adapter, power outlet, and Receiver DC 5V port.
Q: What should I do if the Transmitter power LED is off?
A: Check the USB connection from the computer to the Transmitter and try another USB port.
Q: What should I do if USB connection is unstable?
A: Use a shorter or higher-quality CAT5e / CAT6 cable, avoid damaged cable ends, and test with one USB device at a time.
Q: Does the USB-EX165-K need external power?
A: Yes. The Receiver needs the included DC 5V/1A power adapter. The Transmitter is powered from the computer USB connection.
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