Outdoor smart lighting
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Sonoff S31 WiFi Smart Plug with Energy Monitoring: Energy monitoring and reporting
The SONOFF S31 smart plug turns any ordinary lamp or fan into a voice-controlled, energy-tracking device. Plug it into an outlet, connect through the eWeLink app, and you can turn your porch light on from your office or schedule your coffee maker to start brewing before you wake. The real power draw? Knowing exactly how much electricity your space heater guzzles. The app shows real-time voltage and amps, and stores 100 days of cost data. That means you can see if that old window AC unit is costing you extra and decide to replace it. Two-way voice control via Alexa or Google Home makes it hands-free—no fumbling for your phone when your hands are full of groceries. And with ETL certification, you know it's built for safe, daily use. It only works on 2.4 GHz Wi-Fi, so check your network before buying. For a simple, affordable way to monitor your home's energy use, this plug delivers clear data and reliable control.
Features
- Remote control via app
- Voice control with Alexa and Google Home
- Schedule and timer settings
- ETL, FCC, RoHS certifications
- 15A capacity
- Energy monitoring and reporting
General specs
- Brand: Sonoff
- Model: S31
- Seller: Retailer
- ID: B08TNF4835
- Brand: SONOFF
- Model: S31
- Timer: Yes
- Scheduling: Yes
- App Control: eWeLink
- Data Storage: 100 days of electricity usage data
- Product Type: WiFi Smart Plug
- Ifttt Support: Yes
- Voice Control: Amazon Alexa, Google Home
- Certifications: ETL, FCC, RoHS
- : 2.4 GHz
- Max Load Current: 15A
- Energy Monitoring: Yes
- Consumption Monitoring Power: Real-time power, current, voltage
- First listed by seller: May 19, 2026
If you are interested in more details, you can find full information on the seller's page.
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Shipping options
Delivery to 
United States
United States
Available
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| Brand | SONOFF | SONOFF | SONOFF | SONOFF | SONOFF | AiSeek |
| Model | S31 | S40 | S40 | S40 Lite | S31 Lite | |
| Color |
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| Rating |
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| Price | €9.53 | €9.53 | €11.35 | €9.69 | €9.61 | €14.85 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Jun 24, 2026 | Jun 24, 2026 | May 29, 2026 | Jun 24, 2026 | May 29, 2026 | May 18, 2026 |
| App Control | eWeLink | eWeLink | eWeLink | |||
| Product Type | WiFi Smart Plug | WiFi Smart Plug | Smart Plug, Smart Outlet Switch | Energy Monitoring Plug | ||
| Energy Monitoring | Yes | Yes | Yes | Real-time power consumption tracking | ||
| Current Rating | 15A | 15A | 15A | |||
| Hub Required | No | No | No | |||
Sonoff S31 Energy monitoring and reporting
€9.53
When this device makes sense
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