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  • Sonoff WiFi Smart Plug S40 Lite
  • WiFi Smart Plug S40 Lite
  • WiFi Smart Plug S40 Lite
  • WiFi Smart Plug S40 Lite
  • WiFi Smart Plug S40 Lite
  • WiFi Smart Plug S40 Lite
  • WiFi Smart Plug S40 Lite

Sonoff WiFi Smart Plug S40 Lite

4.2
134 ratings
Launch Year: 2021

Model: S40TPB Lite

$11.99
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Our review

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 verdict

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.

Best for
  • 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.

At a glance

Summary

Everything this plug supports, grouped by category.

Size & Materials
3 × 1.6 × 1.3 in (76 × 40 × 32 mm)2.6 oz (74 g)
Connectivity
2.4 GHz WiFiBluetooth (For Pairing)
Integrations
Google HomeAlexaSamsung SmartThingsHome AssistantIFTTT
Features
On/Off Button

Price History

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Company
Sonoff logo

Sonoff

4.4/ 5 avg ratingChina flagHeadquartered in China

Sonoff, a brand of ITEAD, makes affordable smart home devices including Wi-Fi and Zigbee switches, smart plugs, relays, sensors and the ZBBridge and Zigbee dongles. Its products work through the eWeLink app and integrate with Alexa and Google Home, and are popular with DIY users and Home Assistant fans for low-cost automation. Sonoff is well known for budget-friendly switches and Zigbee hardware.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials

Weather Resistance

NO

Dimensions

3 × 1.6 × 1.3 in (76 × 40 × 32 mm)

Weight

2.6 oz (74 g)

Available in colors

NO

Power

Plug Format

Type B

Maximum Load Power

1500W

Maximum Load Current

15A

Load Voltage

100V

Overheat/Overload Protection

NO

Energy Monitoring

NO

USB Charging

NO

Connectivity

2.4 GHz WiFi

YES

5 GHz WiFi

NO

Bluetooth

For Pairing

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Integrations

Google Home

YES

Alexa

YES

Apple HomeKit

NO

Samsung SmartThings

YES

Home Assistant

YES

IFTTT

YES

Matter

NO

Features

On/Off Button

YES

Zibgee Router

NO

Automations

YES

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