Sonoff Zigbee Smart Plug S40 Lite Review: A Reliable Zigbee Router for Home Assistant Networks
A hub-dependent Zigbee plug that doubles as a router to extend mesh range, pairing quickly with Home Assistant and Zigbee2MQTT, with occasional friction reported on SmartThings hubs.
The Sonoff Zigbee Smart Plug S40 Lite is built less as a standalone gadget and more as a building block for an existing Zigbee mesh network. Owners buy it specifically to extend Zigbee range as a router while also gaining a switchable outlet, and most report it pairs quickly and works reliably with Home Assistant and Zigbee2MQTT setups, including at long distances from the coordinator. It needs a Zigbee hub to function at all, and a handful of buyers using SmartThings hubs ran into pairing or stability issues. For Home Assistant and Zigbee2MQTT users building out mesh coverage, it is a dependable, affordable pick.
- Home Assistant and Zigbee2MQTT users
- Extending Zigbee mesh range
- Budget buyers with an existing Zigbee hub
- Outbuilding or shed automation
Pros
- Works as a Zigbee router, extending mesh range to distant devices
- Pairs quickly and automatically with Home Assistant and Zigbee2MQTT
- Reliable for months of use in sheds and outbuildings
- Fast response time when switching
- Affordable price
Cons
- Requires a separate Zigbee hub, no standalone Wi-Fi or Bluetooth
- No energy monitoring or overheat/overload protection
- Some SmartThings hub users reported pairing or stability issues
- No Apple Home or Matter support
- Not weather-resistant, indoor use only
Who is the Sonoff Zigbee Smart Plug S40 Lite for?
This plug is aimed at buyers who already run a Zigbee network and want to both control an outlet and strengthen mesh coverage, since it also functions as a Zigbee router that repeats signal to other devices further from the coordinator. Owners use it to bring reliable Zigbee signal to sheds and outbuildings well over a hundred feet from their hub, and to boost the link quality of sensors on the far side of a house.
What buyers love
The most consistent praise is for how well it performs as a Zigbee router, extending range to distant sensors and outbuildings, matching its supported zigbee-router feature. Reviewers using Home Assistant and Zigbee2MQTT describe pairing as fast, often automatic with no manual configuration, and report the plug reacts to commands almost instantly. Several owners specifically bought multiple units as repeaters for an expanding Sonoff-based Zigbee network and found them dependable over months of use.
What to know before you buy
This plug requires a Zigbee hub, such as a Sonoff Zigbee Bridge or a compatible coordinator like a Sonoff USB dongle, and does not connect over Wi-Fi or Bluetooth at all, so it cannot work standalone. It also skips energy monitoring and overheat/overload protection, unlike some other Sonoff plugs. A few reviewers using SmartThings hubs reported pairing failures or other connected devices behaving intermittently after adding this plug, so SmartThings users should be aware compatibility has been inconsistent for some buyers. One long-term Home Assistant user also reported a unit that stopped communicating with the coordinator after months of reliable use, though it also does not include Apple Home or Matter support.
Is the Sonoff Zigbee Smart Plug S40 Lite worth it?
With a 1800W/15A rating, Zigbee router functionality, and support for Google Home, Alexa, Samsung SmartThings, IFTTT and Home Assistant, this plug is a smart, low-cost way to add both an outlet and mesh coverage to a Zigbee network. Feedback from Home Assistant and Zigbee2MQTT users is strongly positive, while SmartThings users have had a more mixed experience, so buyers should weigh which hub ecosystem they run before choosing this model.
Frequently asked questions
Does the Sonoff Zigbee Smart Plug S40 Lite need a hub?
Yes, it requires a Zigbee hub or coordinator, such as a Sonoff Zigbee Bridge or a Zigbee2MQTT-compatible dongle. It does not connect over Wi-Fi or Bluetooth.
Does it work as a Zigbee range extender?
Yes, it doubles as a Zigbee router, repeating signal to help other Zigbee devices further from the coordinator stay connected.
Does it work with Home Assistant?
Yes, reviewers report it pairs quickly and reliably with Home Assistant, including through Zigbee2MQTT and ZHA.
Does it work with Samsung SmartThings?
It supports SmartThings, though a few reviewers reported pairing difficulties or other devices behaving intermittently after adding it to a SmartThings hub.
Does the Sonoff Zigbee Smart Plug S40 Lite monitor energy usage?
No, this model does not include energy monitoring or overheat/overload protection.







