SONOFF S31 15A US Wi-Fi Smart Plug Power Monitoring Remote Control Outlet Smart Scene Voice Control via eWeLink Google Alexa
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Specifications
- Brand Name
- SONOFF
- Communication method
- Bluetooth-Compatible, Wi-fi
- High-concerned chemical
- None
- Origin
- Mainland China
- Compatibility
- All Compatible
- State of Assembly
- Ready-to-Go
- Camera Equipped
- No
- Certification
- CE
- Model Number
- S31 US
- Max. Current
- 15A
- Voltage Input
- 90~264V AC, 50/60HZ
- Wireless Standard
- 2.4GHz, 802.11 b/g/n
- Receive Sensitivity
- 802.11b: <-84dBm(11Mbps); 802.11g: <-68dBm(54Mbps)
- Output Power
- 802.11b:16±2dBm; 802.11g:13±2dBm
- Security Mechanism
- WEP/WPA-PSK/WPA2-PSK
- Encryption
- AES/TKIP
- Working Temp
- -20 °C ~ 75 °C
- Working Humidity
- 10%-80%
- Product Dimensions
- 75.7x39.7x32mm
Product Description
SONOFF S31 15A US Wi-Fi Smart Plug Power Monitoring Remote Control Outlet Smart Scene Voice Control via eWeLink Google Alexa
SONOFF S31 is a compact and lightweight US standard Wi-Fi smart plug with power monitoring. Both S31 and S31 Lite are UL certificated, this means they reach the indispensable security and reliability standard that a smart plug must have. Note that power consumption and over-load protection are available for S31.
The smart plug lets you control home appliances via eWeLink APP anywhere, anytime. Also, third-party platforms like Amazon Alexa and Google Assistant can seamlessly work with this plug for a voice-controlled home. The small size makes the smart plug will not occupy another outlet of your socket or power strip during, which reserves more space for other plugs. Convenient to use, plug and play.
Bring a S31 home, keeping track of the real-time power, current and voltage of your home appliances via APP to view which one is power-hungry and power-saving. You can also measure electricity consumption for a specified period. Besides, Features over-load protection which allows you to set the power, current and voltage value for your appliances, and this smart plug will automatically turn off connected devices in case of reaching any one of the set value. S31 provides you 100 days of historical power consumption data record (support to export) and monthly electricity bill forecast. Monitor and understand which appliances are consuming most, then create scheduled or countdown timers to keep your electricity bill down. For other features like smart scene, sync status, share control, these are the same as S20 smart plug.
Track Electricity Usage Every Moment
Comprehensively know about your devices including power, current and voltage, and view 100-day history electricity consumption record.
Serious about Safety
Add over-load protection to guarantee enough safety of devices in use.
Hands-free Voice Control
Work with Alexa & Google Home and allow you to control lights on/off with your voice.
Mobile Remote Control, Within Reach
Devices run in your home, you manage on the go.
When to Start and Stop, Just Give A Time to Devices
Schedule a time to devices and they will turn on/off automatically.
Works With Apple Home Via Matter Bridge
Seamlessly connect SONOFF WiFi devices to Matter via CUBE OS built-in Matter Bridge-- free, local, and ready for Apple Home, Google Home, Alexa, SmartThings, and Home Assistant.
Mini & Thin, More Space Reserved
Small and compact body will not block adjacent outlets.
A Smart Scene, More Than A Device Triggered
Enable this mode to trigger on/off one or groups of SONOFF devices via a device or single tap.
Compatible With IFTTT
Set one device on/off to make other device active or inactive, or remind you about the device status via a message alert.
Product Details
Pros & Cons
Pros
- Built-in power monitoring to track and optimize energy usage for connected devices
- Voice control compatibility with Google Assistant and Amazon Alexa, plus app control via eWeLink
- Compact US-standard design that fits into wall outlets without blocking adjacent ports
- UL certified for safe, reliable performance
Cons
- Only supports 2.4GHz Wi-Fi networks; does not work with 5GHz Wi-Fi
- No built-in battery, requiring a constant Wi-Fi and power connection to function
- Working temperature range of -20°C to 75°C makes it unsuitable for extreme outdoor use
- Product description is cut off, missing full details on smart scene automation features
Common Questions
What devices is this SONOFF S31 smart plug compatible with?
It is compatible with all standard US plug devices, and works with Google Assistant and Amazon Alexa for voice control via the eWeLink app.
Does this smart plug include power monitoring functionality?
Yes, this smart plug has built-in power monitoring to track energy usage for connected devices.
What wireless connectivity does this plug use?
It uses 2.4GHz Wi-Fi (802.11 b/g/n) for wireless connectivity, and does not support Bluetooth.
Is this smart plug safety certified?
Yes, both the S31 and S31 Lite models are UL certified, meeting strict safety standards.
What is the maximum electrical rating for this smart plug?
It has a maximum current of 15A, and supports input voltage between 90~264V AC at 50/60HZ.
Product information last updated on March 12, 2026