OK found it (hidden in FAQ at the very bottom
)
Lightning Sensor
(AMS AS3935)
detects cloud-to-cloud and cloud-to-ground lightning strikes up to 40 km (25 miles)
estimates strength distance to leading edge of storm
Temperature/Humidity Sensor
(Silicon Labs Si7021)
air temperature -40° to 85 °C +/- 0.4 °C
relative humidity 0 to 100% +/- 4%
reports dew point & apparent temperature
Pressure Sensor
(Bosch BMP280)
atmospheric (barometric) pressure up to 1100 mbar +/- 1 mbar
reports both station pressure & mean sea level pressure
Haptic Rain Sensor
(WeatherFlow design)
detects the instant it starts to rain
provides hourly rate & daily accumulation at 0.2mm resolution
Sonic Wind Sensor
(WeatherFlow design)
continuously samples wind speed and direction 0 to 100 mph +/- 0.5 mph
calculates one-minute and five-minute average speed, direction & gust
Light Sensor
(Silicon Labs Si1132)
visible and infrared ambient light 1 to 128 kLUX +/- 100 mLUX
UV index (0-11+)
reports solar radiation 0 to 1900 W/m2 +/- 5%