User Manual for SONOFF models including: S40 Energy Monitoring Wi-Fi Smart Plug, S40, Energy Monitoring Wi-Fi Smart Plug, Monitoring Wi-Fi Smart Plug, Wi-Fi Smart Plug, Smart Plug, Plug
SONOFF S40 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home Assistant, IFTTT Supporting, 2.4Ghz WiFi Only -A Certified for Humans Device
SONOFF S31 WiFi Smart Plug with Energy Monitoring, 15A Smart Outlet Socket ETL Certified, Work with Alexa & Google Home Assistant, IFTTT Supporting, 2.4 Ghz WiFi Only (1-Pack) - Amazon.com