Sonoff TH10/16 WiFi Relays Support Temperature and Humidity Probes

Sonoff are dirt cheap WiFi AC/DC relay systems based on ESP8266 selling for about $5 with board and case. They are made by ITEAD Studio, and the company

Sonoff TH10 & TH16: Sensors, Displays, Actuators, - Tinkerman

SONOFF TH Origin Smart Temperature and Humidity Monitoring Switch (TH10/16 Upgrade Version)

Sonoff TH10 & TH16: Sensors, Displays, Actuators, - Tinkerman

Sonoff TH Origin Smart Temp and Humidity Switch (16A or 20A - sensors optional) - ISP Home

Sonoff TH10 Relay Module Smart Home Wifi Switch Humidity Sensor Temperature Monitor Works With Alexa Google Home - AliExpress

Sonoff TH10/16 WiFi Relays Support Temperature and Humidity Probes - CNX Software

Sonoff TH16 Origin (R3) WiFi smart relay (230V/16A) with sensor input (THR316) - eWelink Store

Sonoff TH10 Relay Module Smart Home Wifi Switch Humidity Sensor Temperature Monitor Works With Alexa Google Home - AliExpress

SONOFF TH Origin Smart Temperature and Humidity Monitoring Switch (TH10/16 Upgrade Version) 16A - Opencircuit

High Accuracy Smart Temperature Sensor Temperature Sensor Humidity Th10 Th16 - New - Aliexpress

SONOFF® TH10 TH16 Smart WIFI Switch Monitoring Temperature Humidity Wifi Smart Switch Home Automation Kit Works With Alexa Google Home - Dr Techlove