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Sonoff S40 WiFi Smart Plug with Energy Monitoring: Monitors energy consumption real-time
Take control of your home's energy usage and reduce your electricity bill with the SONOFF S40 WiFi Smart Plug. This ETL-certified smart outlet not only lets you turn any appliance on or off from anywhere using your phone, but it also tracks real-time power, current, and voltage. You can view daily, monthly, or 100-day energy consumption data and even estimate your electricity costs. Perfect for high-wattage devices like space heaters, air conditioners, or window units—the 15A rating handles loads up to 1800W.
Set timers or schedules to automate your coffee maker, lamps, or fans. Use the eWeLink app to create countdowns, repeat schedules, or sunrise/sunset triggers. Voice control via Amazon Alexa or Google Assistant makes it easy to turn devices on and off hands-free. Share access with family members so everyone can manage connected appliances. Works only with 2.4GHz Wi-Fi.
Features
- Works with Alexa & Google Home
- Remote control via app
- Set time schedules and timers
- Share control with others
- Monitors energy consumption real-time
General specs
- Brand: Sonoff
- Model: S40
- Seller: Retailer
- ID: B09LGZNQD8
- Type: WiFi Smart Plug
- Brand: SONOFF
- Model: S40
- Pack Size: 1-Pack
- Scheduling: Yes
- Ifttt Support: Yes
- Share Control: Yes
- Voice Control: Amazon Alexa, Google Assistant
- Current Rating: 15A
- Remote Control: Yes
- WiFi Frequency: 2.4 GHz
- Energy Monitoring: Yes
- 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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Sonoff S40 Monitors energy consumption real-time
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| Brand | SONOFF | SONOFF | SONOFF | SONOFF | SONOFF | |
| Model | S40 | S31 | S40 | S31 Lite | S40 Lite | |
| Color | ||||||
| Rating |
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| Price | €9.53 | €9.53 | €11.35 | €9.61 | €9.69 | €21.84 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Jun 24, 2026 | Jun 24, 2026 | May 29, 2026 | May 29, 2026 | Jun 24, 2026 | Jun 24, 2026 |
| Energy Monitoring | Yes | Yes | Yes | |||
| App Control | eWeLink | eWeLink | eWeLink | |||
| Product Type | WiFi Smart Plug | Smart Plug, Smart Outlet Switch | WiFi Smart Plug | Smart WiFi Bulb Socket, Light Bulb Adapter | ||
| Hub Required | No | No | No | |||
Sonoff S40 Monitors energy consumption real-time
€9.53
When this device makes sense
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