I'm checking out Sonoff ZigBee sensors by ITEAD - what's the budget sensors like?
Is it good? Sonoff SNZB-02D sensor - NotEnoughTech
Sonoff MiniR4 is extreme(ly) small - NotEnoughTech
Does Blitzwolf Zigbee sensor work with Sonoff?
Sonoff Zigbee sensors - NotEnoughTech
Sonoff MiniR4 is extreme(ly) small - NotEnoughTech
Playing with Sonoff Zigbee & WiFi automation - Part 1: Hardware overview - CNX Software
Sonoff Zigbee sensors - NotEnoughTech
Are new Sonoff ZigBee Sensors better?
Sonoff Presence Sensor (SNZB-06P) is not what you think - NotEnoughTech
Smart Devices Archives - NotEnoughTech
Even smaller ZigBee switch: Sonoff ZB Mini Extreme (no neutral)
What's so PRO about Sonoff ZigBee Bridge Pro - NotEnoughTech
Sonoff Zigbee Smart Home Devices
Sonoff Zigbee Button - Battery operate light switch
SONOFF Zigbee Motion Sensor - SNZB-03P