Product Description
Huawei E3372-325 (SKU: USB-4G-DONGLE-HUAWEI-E3372-325) is an unlocked LTE Cat4 USB modem for backup connectivity on CCTV and networking jobs where a wired feed isn't available.
Key specs
- Modem chipset class: LTE Category 4 — up to 150 Mbps down / 50 Mbps up, network-dependent
- Interface: USB 2.0, plug-and-play, web-based management UI (no drivers to install for basic setup)
- Network support: LTE, 3G UMTS, 2G GSM — unlocked, works with SIMs from most mobile operators
- LTE bands: 800 / 900 / 1800 / 2100 / 2600 MHz — covers the frequencies most UK and European operators use
- Antennas: dual CRC-9 external connectors for sites with marginal signal
- OS support: Windows, macOS, Linux
- Weight: approx. 35 g, standard USB stick form factor
On install jobs, this is typically deployed as a temporary or backup WAN uplink for an NVR or router at a site awaiting fixed-line install, or as a fallback path for remote monitoring where mobile coverage is the only option. The CRC-9 ports matter on marginal sites — a directional or panel external antenna can pull a Cat4 connection back up to usable throughput without relocating the host device.
Because it's unlocked, no operator lock-in applies — swap SIMs between jobs or operators as coverage dictates. Actual throughput depends entirely on local network conditions, not just the modem's rated ceiling.
Technical Specifications
Frequently Asked Questions
What antennas can I use with the E3372-325?
It has two CRC-9 connectors, so you can fit an external antenna to improve reception on sites with weak or marginal mobile signal.
Is the dongle locked to a specific network?
No — it's an unlocked device and is compatible with SIM cards from most mobile network operators.
What's the maximum realistic speed I'll get?
The modem is rated up to 150Mbps download and 50Mbps upload using LTE Cat4, but actual throughput depends on local network coverage and signal conditions.
Will it work with my router, or only a laptop/PC?
It connects via USB 2.0 and is designed for laptops and PCs, and is also compatible with routers that support USB modem input.
