300Mbps High Gain Wireless USB Adapter

Provides fast 300Mbps Wi-Fi connections for wired devices
Two 5dBi high gain antennas deliver enhanced reception and transmission performance
With 2×2 MIMO, users can easily access to high-speed wireless connection
Supports Windows 11/10/8.1/8/7/XP (32/64bit)

Equip Your Devices with Wireless Connectivity

300Mbps High Gain Wireless USB Adapter


Two High Gain 5dBi Antennas Leads to Maximized Range

MW300UH has two high-gain external antennas to ensure stronger signal transmission and reception, which helps users to gain a stable Wi-Fi connection across their home.

Regular Adapter

High gain adapter

Desktop Design Greatly Avoids Signal Blocking

The cable makes it easy to find a spot for MW300UH in your workplace. Moreover, compared to the slot-inserted adapters, this design allows you to put it nearer to the router, in which way it can receive stronger signals.

  • Easy Setup

    A friendly user interface on a CD for simple installation.

  • Operating System

    Compatible with Windows 10/8.1/8/7/XP

*Maximum wireless signal rates are the physical rates derived from IEEE Standard 802.11 specifications. Actual wireless data throughput and wireless coverage are not guaranteed and will vary as a result of 1) environmental factors, including building materials, physical objects, and obstacles, 2) network conditions, including local interference, volume and density of traffic, product location, network complexity, and network overhead, and 3) AP limitations, including rated performance, location, connection quality, and AP condition. *To ensure compatibility, you may need to update the adapter’s drivers after an OS update. You can find our latest drivers in the download center at http://www.mercusys.com/en/support.

Actual network speed may be limited by the rate of the product's Ethernet WAN or LAN port, the rate supported by the network cable, Internet service provider factors and other environmental conditions.

Wireless Standards

IEEE 802.11n, IEEE 802.11g, IEEE 802.11b


2.400 - 2.4835 GHz

WiFi Speeds

11n: Up to 300 Mbps (Dynamic)

11g: Up to 54 Mbps (Dynamic)

11b: Up to 11 Mbps (Dynamic)

Reception Sensitivity

300M: -68 dBm@10% PER

270M: -68 dBm@10% PER

144M: -71 dBm@10% PER

130M: -71 dBm@10% PER

54M: -74 dBm@10% PER

11M: -86 dBm@8% PER

6M: -90 dBm@10% PER

1M: -94 dBm@8% PER

Transmission Power

≤20 dBm (EIRP)

Wireless Security



4.46 × 2.51 × 0.85 in. (without antennas)

4.46 × 3.96 × 7.92 in. (with vertical antennas)


113.2 × 63.8   × 21.7 mm  (without antennas)

113.2 × 100.5 × 201.1 mm(with vertical antennas)


Micro USB 2.0

Antenna Type




Package Contents

300 Mbps High Gain Wireless USB Adapter (MW300UH)

Quick Installation Guide

Resource CD

USB Cable (Micro USB to USB A)


Operating temperature: 0C ~ 40C (32F ~ 104F)

Storage temperature: -40C ~ 70C (-40F ~ 158F)

Operating humidity: 10% ~ 90% Non-Condensing

Storage humidity: 5% ~ 90% Non-Condensing

System Requirements

Windows 11/10/8.1/8/7/XP (32/64bit)