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 TH Origin Smart Temperature and Humidity Monitoring Switch (TH10/16 Upgrade Version) – C.B.Electronics

Sonoff TH - Tasmota

Sonoff Sensor AM2301 / DHT21 (IM160712004) temperature/humidity sensor for Sonoff board for TH10/TH16

Sonoff POW and Sonoff TH16 WiFi Relays Review - Part 1: The Hardware - CNX Software

SONOFF THR316 Origin 16A Smart Switch with Temperature and Humidity Monitoring Compatible with Alexa/Google Home/IFTTT (TH10/16 Upgrade Version) : : Tools & Home Improvement

SonOff TH10/16 Tasmota 9.2 - Devices & Integrations - SmartThings Community

Sonoff TH10 and TH16 - Scargill's Tech Blog

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

Sonoff TH10/15A Smart Wifi Switch Monitoring Wireless Probe Temperature Humidity Sensor Switch Wifi Smart Home Remote Controller - Price history & Review, AliExpress Seller - FastMarket Store

Sonoff TH10 and TH16 - Scargill's Tech Blog