SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (S31): SONOFF's clean product image of the S31 WiFi Smart Plug with Energy Monitoring US Type (S31) on its own product page; the image is captioned "S31".

1 photo · Image from sonoff.tech

Photo sources

Manufacturer and seller images. Configuration examples may include additional equipment.

Image source: SONOFF's clean product image of the S31 WiFi Smart Plug with Energy Monitoring US Type (S31) on its own product page; the image is captioned "S31".

SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (S31)

Name: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (S31)
Brand: SONOFF
SKU: S31

By SONOFFSKU S31

Energy monitors

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Device typeSmart plug Max switched load (A)15 AMax switched load (W)Not statedMeasurement channelsNot stated Current sensorsNot stated Current ratingNot stated

Key specs

Units

SKU: S31
Official product page
Sources
Printed as "Model: S31 S31 S31 Lite".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: variant selector
Documented
Device type: Smart plug
Official product page
Sources
Printed as "WiFi Smart Plug with Energy Monitoring US Type"; "Note: Only S31 supports energy monitoring. S31 Lite does not include energy monitoring functionality.".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: product title
Documented
Power input: Voltage Input 120V AC 60Hz
Official product page
Sources
Printed as "Voltage Input 120V AC 60Hz".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Communications: Wireless Standard 2.4GHz, 802.11 b/g/n
Official product page
Sources
Printed as "Wireless Standard 2.4GHz, 802.11 b/g/n".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Max switched load (A): 15 A
Official product page
Sources
Maximum switched load printed as "Max. Current 15A".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: spec table
Documented
Operating temperature: 0 to 30 °C32 to 86 °F converted
Official product page
Sources
Printed as "Working Temp 0 °C ~ 30 °C".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: spec table
Documented

All specs5

Device type: Smart plug
Official product page
Sources
Printed as "WiFi Smart Plug with Energy Monitoring US Type"; "Note: Only S31 supports energy monitoring. S31 Lite does not include energy monitoring functionality.".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: product title
Documented
Power input: Voltage Input 120V AC 60Hz
Official product page
Sources
Printed as "Voltage Input 120V AC 60Hz".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Communications: Wireless Standard 2.4GHz, 802.11 b/g/n
Official product page
Sources
Printed as "Wireless Standard 2.4GHz, 802.11 b/g/n".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Max switched load (A): 15 A
Official product page
Sources
Maximum switched load printed as "Max. Current 15A".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: spec table
Documented
Operating temperature: 0 to 30 °C32 to 86 °F converted
Official product page
Sources
Printed as "Working Temp 0 °C ~ 30 °C".
Official product page: SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: spec table
Documented

Published claims and calculations, not independent test results.

Documents

2 on file

PDF
SONOFF S31 / S31 Lite user manual foldout (V1.3, drawing dated 2025/02/28)OfficialSONOFFOfficial user manual
Source details
Revision
V1.3
Revision date
Not stated
Archived copy captured on 2026-10-29.
Location: Page 1, cover panel and specification panel
Retrieved Oct 28, 2026
SONOFF's own one-page user manual foldout for the S31 and S31 Lite smart plugs (US type), served from its store's file host; it prints V1.3 and a drawing date of 2025/02/28 (an address-change date, not a release date). The specification panel covers S31 and S31 Lite at 120V~ 60Hz, 15A max; the feature panel says the S31 Lite has no power monitoring. Read with Apple Vision OCR committed beside this configuration (the PDF has no text layer). Compliance marks and FCC/IC identifiers in it are the maker's claims, not checked with the issuers. Manufacturer claims, not independent tests.
Archived copies
Archived copy of a document published by SONOFF. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
Archived backup V1.3 · 2.37 MB
Archived copy, unaltered, kept as a record of what SONOFF published. Original address: https://cdn.shopify.com/s/files/1/0742/9963/8001/files/User_Manual_S31_S31_Lite_V1.3.pdf?v=1748417766. Copyright and takedown
Source first found
Oct 29, 2026
This copy captured
Oct 28, 2026, 6:45 PM PDT
Archived
Oct 28, 2026, 6:45 PM PDT
File details
Original source
Pages
1
Embedded creation date
Feb 27, 2025
Embedded modification date
Feb 27, 2025
Embedded dates are file metadata, not independent proof of publication.
SHA-256: 04ebb51027387cae612b029d664469aa39daf38289879e2619f18750ddeba267
Open
WEB
SONOFF product page: SONOFF S31 WiFi Smart Plug with Energy Monitoring US Type (captured October 12, 2026)OfficialSONOFFOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-12.
Location: Product page
Retrieved Oct 12, 2026
SONOFF's own product page, captured October 12, 2026 with the paced research fetcher. Manufacturer statements, not independent tests.
Open

Archive and older revisions0

Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.

Archived documents

SONOFF S31 / S31 Lite user manual foldout (V1.3, drawing dated 2025/02/28)

Archived copy of a document published by SONOFF. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.

Archived backup V1.3 · 2.37 MB

Archived copy, unaltered, kept as a record of what SONOFF published. Original address: https://cdn.shopify.com/s/files/1/0742/9963/8001/files/User_Manual_S31_S31_Lite_V1.3.pdf?v=1748417766. Copyright and takedown