38 Zigbee sensors confirmed compatible with SONOFF iHost. Each sensor also shows every other platform it supports.
Tuya 40ZH-OMotion SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+3✓ Works with 6 platforms
Tuya IH-K009Temperature & Humidity SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Tuya IH012-RT02Motion SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+1✓ Works with 4 platforms
Tuya SNTZ007Contact SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+3✓ Works with 6 platforms
Tuya TS0203Contact SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Tuya ZXZTHTemperature and Humidity SensorZigbee2MQTTdeCONZZigbee2Tasmota+3✓ Works with 6 platforms
Sonoff SNZB-02Temperature And Humidity SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+4✓ Works with 7 platforms
Sonoff SNZB-02DLCD Temperature Humidity SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Sonoff SNZB-03Motion SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+4✓ Works with 7 platforms
Sonoff SNZB-04Wireless Door/Window SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+4✓ Works with 7 platforms
Sonoff SNZB-06PHuman Presence SensorZHA (Home Assistant)Zigbee2MQTTZigbee2Tasmota+2✓ Works with 5 platforms
Alecto SMART-DOOR10Door/Window Contact SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Alecto SMART-MOTION10Motion SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Alecto SMART-TEMP10Temperature and Humidity SensorZigbee2MQTTdeCONZZigbee2Tasmota+3✓ Works with 6 platforms
Hihome WZB-PIRPIR Motion DetectorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Hihome WZB-SDSDoor/Window SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+3✓ Works with 6 platforms
Hihome WZB-STHTemperature and Humidity SensorZigbee2MQTTdeCONZZigbee2Tasmota+3✓ Works with 6 platforms
Moes RH3052Temperature And Humidity SensorZigbee2MQTTdeCONZZigbee2Tasmota+3✓ Works with 6 platforms
Moes ZB-XGMWindow Door Gate Sensor DetectorZHA (Home Assistant)Zigbee2MQTTdeCONZ+3✓ Works with 6 platforms
Moes ZSS-X-PIRL-CPIR Motion Sensor Human DetectorZHA (Home Assistant)Zigbee2MQTTdeCONZ+4✓ Works with 7 platforms
Rehent RH-ZMS1PIR Motion SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Rehent RH-ZMS2PIR Motion SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Rehent RH-ZTH1Temperature and Humidity SensorZigbee2MQTTdeCONZZigbee2Tasmota+3✓ Works with 6 platforms
SmartThings IM6001-MPP01Multipurpose Sensor (2018 model)ZHA (Home Assistant)Zigbee2MQTTdeCONZ+1✓ Works with 4 platforms
SmartThings IM6001-MTP01Motion Sensor (2018 model)ZHA (Home Assistant)Zigbee2MQTTdeCONZ+1✓ Works with 4 platforms
SmartThings IM6001-WLP01Water Leak Sensor (2018 model)ZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Aqara MCCGQ12LMDoor and Window Sensor T1ZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Aqara SJCGQ12LMWater Leak Sensor T1ZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
BlitzWolf BW-IS2Contact SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+3✓ Works with 6 platforms
BlitzWolf BW-IS8Temperature and Humidity SensorZigbee2MQTTdeCONZZigbee2Tasmota+3✓ Works with 6 platforms
Nedis ZBSD10WTDoor Window SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platforms
Nedis ZBSM10WTSmartLife Motion SensorZHA (Home Assistant)Zigbee2MQTTdeCONZ+2✓ Works with 5 platformsWe list 38 Zigbee sensors confirmed compatible with SONOFF iHost. Each one also shows every other platform it supports.
Not every sensor is supported — it depends on whether SONOFF iHost (or the underlying bridge) has a device handler for it. The list above is limited to sensors confirmed to work with SONOFF iHost.
You need a Zigbee coordinator (USB stick) connected to SONOFF iHost. Once the coordinator is set up, you pair the sensor and it's controllable from SONOFF iHost.