Xiaomi MI ROUTER 4A

Description

The Xiaomi Mi Router 4A is a home networking device designed to provide a central point for connecting compatible devices to a network.

Presented in a white finish, this product combines Xiaomi branding with the Mi Router 4A model designation for straightforward identification in a networking setup.

Design & Build

• Product type: The Xiaomi Mi Router 4A Gigabit Edition, model R4A, is a dual-band AC1200 wireless router intended for homes and small offices.
• Dimensions: The router measures 188 × 100.5 × 175 mm, with the external antennas installed in their upright operating position.
• Weight: The unit weighs approximately 380 g excluding the external power adapter and Ethernet cables.
• Antenna layout: Four external omnidirectional high-gain antennas provide 2 × 2 MIMO operation on the 2.4 GHz band and 2 × 2 MIMO operation on the 5 GHz band.
• Cooling: The fanless enclosure uses passive heat dissipation through its internal thermal design and exterior ventilation; there is no active cooling fan.
• Controls: Physical controls are limited to the reset function and status indicators; most network settings are configured through the web interface or Mi Wi-Fi application.

Display

• Status indicators: Front-panel LED indicators communicate power, Internet/WAN and system or network status.
• Configuration interface: Router status, connected clients, wireless settings and security options are viewed through the web-based administration interface or compatible mobile application rather than a physical screen.

Performance

• Wireless capacity: The AC1200 rating combines a maximum theoretical 300 Mbps link rate on 2.4 GHz with a maximum theoretical 867 Mbps link rate on 5 GHz, producing a combined rating of 1,167 Mbps rather than a single-client Internet speed.
• 2.4 GHz radio: Supports IEEE 802.11b/g/n operation with up to 300 Mbps theoretical PHY rate using 2 × 2 MIMO and 40 MHz channel bandwidth where local regulatory conditions and interference permit.
• 5 GHz radio: Supports IEEE 802.11a/n/ac operation with up to 867 Mbps theoretical PHY rate using 2 × 2 MIMO and 80 MHz 802.11ac channel bandwidth.
• Processor: A MediaTek MT7621A dual-core MIPS processor operating at 880 MHz handles routing, NAT, wireless coordination and device-management tasks.
• Memory: 128 MB of DDR3 RAM supports the firmware and connected-device tables, while 16 MB of flash storage holds the operating system and configuration data.
• Concurrent operation: The two radio bands can operate simultaneously, allowing compatible clients to use 2.4 GHz for range and 5 GHz for higher-throughput local networking.
• Device capacity: Xiaomi documentation and product materials specify support for up to 64 simultaneously connected devices; practical performance depends on traffic type, channel conditions, client hardware and broadband speed.
• Throughput qualification: The 300 Mbps, 867 Mbps and 1,167 Mbps figures are theoretical wireless link-rate values. Actual application throughput is lower because of protocol overhead, interference, signal attenuation and client limitations.
• Power input: Power is supplied through the included external AC adapter; the router itself is not charged through USB-C, micro-USB or a battery-charging circuit.
• Power behavior: Wireless networking, routing and status indicators require continuous external power and stop operating if the adapter is disconnected.

Software & AI

• Operating system: Mi Wi-Fi ROM is an intelligent router operating system based on a highly customized version of OpenWRT.
• Administration: The firmware provides web-based setup for Internet connection type, wireless names, wireless passwords, LAN parameters, DHCP, DNS and firmware management.
• Mobile management: Compatible Mi Wi-Fi mobile-app management enables remote viewing of connected clients, network status and selected router controls.
• Parental controls: Child-safety functions can restrict or manage internet access for selected devices through scheduling and device-level controls, subject to firmware and regional availability.
• Traffic management: Device-level management supports viewing connected clients, changing access permissions and applying network-priority or access-control settings where provided by the installed firmware.
• Updates: Firmware updates and available functions can vary by hardware region, software version and Xiaomi account or application compatibility.

Connectivity

• WAN port: One RJ-45 10/100/1000 Mbps Gigabit Ethernet WAN port connects the router to a modem, optical-network terminal or upstream Ethernet network.
• LAN ports: Two RJ-45 10/100/1000 Mbps Gigabit Ethernet LAN ports provide wired connections for computers, televisions, storage devices, switches and other network equipment.
• Wireless security: Supported security functions include WPA-PSK/WPA2-PSK encryption, SSID hiding, MAC-address filtering, IP/MAC binding and protection against common denial-of-service and network attacks.
• IPv6: IPv6 support enables operation on compatible IPv6 broadband networks in addition to conventional IPv4 networking.
• Network services: The router supports core home-network functions including DHCP, NAT, DNS forwarding, guest access and configurable wireless network names and passwords.
• Ethernet limitation: Although the wireless product rating is AC1200, every wired connection is limited to a maximum negotiated rate of 1,000 Mbps before Ethernet and protocol overhead.
• Frequency bands: The router operates on the 2.4 GHz and 5 GHz Wi-Fi bands; actual channel availability and transmit power are subject to regional regulations.

Colors

• Available finish: The Mi Router 4A Gigabit Edition is commonly supplied in white.
• Exterior material: The white enclosure uses a minimalist, fanless plastic design with four matching external antennas.
• Color qualification: Retail color availability can vary by market and hardware revision; the standard R4A Gigabit Edition specification is the white version.

Ideal For

• Home networking setups
• Connecting household devices to a network
• Users seeking a Xiaomi-branded router