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Supply voltage: 1.5V-3.6 Humidity measuring range: 0-100% RH Temperature measurement range: -40 ℃~105 ℃ Maximum power consumption: 2.7uW Of communication: I2C Accuracy range humidity (10% RH to 95% RH): HTU21D ± 2% RH Humidity Hysteresis: ± 1% RH Measuring time: 50ms Annual shift: -0.5% RH / year Response time: 5 s Weight:0.9g Size:3*3*1.1mm(L*W*H) Note: HTU21D can SHT20, SHT21 fully compatible, can achieve "Pin to Pin", without modifying the hardware on board pins. Software programs and also SHT20, SHT21 same can be achieved compatible replacement, without making any changes. It has a good price advantage, very cost-effective.