Sonoff WiFi Smart Plug S40 Lite Review: A No-Frills Plug for Simple Voice Control
An affordable Wi-Fi plug that owners praise for painless setup with Alexa and Google Home, though it leans on the eWeLink cloud app and skips energy monitoring.
The Sonoff S40 Lite is a straightforward smart plug for buyers who just want reliable remote and voice control at a low price. Most owners report quick, painless setup and smooth linking to Alexa or Google Home, making it a good fit for simple tasks like controlling a lamp or small appliance. It skips energy monitoring and overload protection, and it depends on the eWeLink app for its cloud features, which some buyers find limiting. A rare but notable complaint involves a unit failing after light use, so this is a budget pick best suited for low-stakes, non-critical outlets rather than mission-critical automation.
- Budget buyers
- Simple voice-control setups
- Alexa and Google Home users
- First-time smart plug buyers
Pros
- Quick, painless setup
- Smooth integration with Alexa and Google Home
- Also works with SmartThings, IFTTT and Home Assistant
- Physical on/off button for manual control
- Affordable price
Cons
- No energy monitoring
- No overheat/overload protection
- Relies on the eWeLink cloud app for setup and automations
- 2.4GHz Wi-Fi only
- No Apple Home or Matter support
Who is the Sonoff WiFi Smart Plug S40 Lite for?
This plug suits buyers who want basic remote and voice control over a lamp or small appliance without paying for extras like energy monitoring. Reviewers use it for everyday convenience, such as turning lights on and off without getting out of bed, and appreciate that it links quickly to existing Google Home or Alexa setups.
What buyers love
The most repeated theme is how easy setup is: multiple reviewers describe the installation and app pairing as quick and painless, with smooth linking to Alexa and Google Home, matching its supported integrations. Buyers also call it a practical, affordable option for basic automation, and its physical on/off button gives a manual fallback.
What to know before you buy
This plug relies on the eWeLink app for setup and cloud automations, and at least one reviewer was uncomfortable with routing control through the app's servers rather than a local connection. It does not include energy monitoring or overheat/overload protection, so buyers who want power usage tracking should look at other Sonoff models. It also lacks Apple Home, Matter and Zigbee support, so it is best suited to Alexa, Google Home, SmartThings, IFTTT or Home Assistant setups. One reviewer reported a unit failing after light use, with flickering behavior that raised a wiring concern, a reminder that this is a budget device and occasional unit-to-unit reliability issues can happen. It also only connects over 2.4GHz Wi-Fi (Bluetooth is used only for initial pairing), so keep it on your 2.4GHz network band.
Is the Sonoff WiFi Smart Plug S40 Lite worth it?
At a low price with a 1500W/15A rating, Alexa, Google Home, SmartThings, IFTTT and Home Assistant support, this plug covers the basics well for buyers who do not need energy monitoring or overload protection. Feedback from most owners is positive on ease of setup and day-to-day reliability, making it a reasonable budget choice for simple, non-critical smart plug needs.
Frequently asked questions
Does the Sonoff S40 Lite include energy monitoring?
No, this model does not include energy monitoring or overheat/overload protection.
Does it work with Alexa and Google Home?
Yes, reviewers report smooth, quick setup linking the plug to both Alexa and Google Home.
Does the Sonoff S40 Lite work with Apple Home or Matter?
No, it does not support Apple Home or Matter. It does support Google Home, Alexa, Samsung SmartThings, IFTTT and Home Assistant.
What app does the Sonoff S40 Lite use?
It uses the eWeLink app for setup, schedules and cloud automations. Some buyers prefer a more local-first connection and find the app's cloud dependency a drawback.
What is the maximum load the Sonoff S40 Lite can handle?
It is rated for up to 1500W and 15A.








