I'm checking out Sonoff ZigBee sensors by ITEAD - what's the budget sensors like?
Using Sonoff ZigBee sensors with Zigbee2MQTT, Tuya, IKEA and Xiaomi?
Is it good? Sonoff SNZB-02D sensor - NotEnoughTech
Getting started with Sonoff ZIGBEE 3.0 USB DONGLE PLUS - NotEnoughTech
Sonoff MiniR4 is extreme(ly) small - NotEnoughTech
Best ZigBee temperature sensors - NotEnoughTech
Sonoff Presence Sensor (SNZB-06P) is not what you think - NotEnoughTech
Sonoff Zigbee temperature and humidity sensor
SNZB-02D Zigbee LCD Smart Temperature Humidity Sensor
Are new Sonoff ZigBee sensors better? - NotEnoughTech
Playing with Sonoff Zigbee & WiFi automation - Part 1: Hardware overview - CNX Software
27 Sonoff SNZB-04 Zigbee door/window battery-operated opening/closing sensor
Does Blitzwolf Zigbee sensor work with Sonoff?
Sonoff Zigbee Smart Home Devices
Sonoff vs Aqara Zigbee Temperature Sensors - Which is better?