Sonoff

SONOFF Temperature and Humidity Sensor Si7021
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Precision Relative Humidity Sensor:  ± 3% RH (max), 0–80% RHHigh Accuracy Temperature Sensor:  ± 0.4°C (max), –10 to 85°C0 to 100% RH operating rangeUp to –40 to +85°C operating rangeWide operating voltage (2.2 to 3.6 V)Low Power ConsumptionFactory-calibratedExcellent long term stability 
SONOFF Wi-Fi smart switch MINI
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Max current: 10AVoltage: 100~240 AC 50/60 Hz2.4Ghz, 802.11.b /g /nWorking temperature: 0°C ~ +40°CWorking humidity: 5%-90%RHAmount of channels: 1Amazon Alexa, Google Assistant, IFTTT, Google NestDimensions: 91*43*25mm (L*W*H)