GreenOK - Wireless Thermo-Hygro MonitorUser’s Manual (Rev 2.0)229. Specification9.1 Wireless Sensing Unit1) Model No. GMS-120(E)2) Measurement range Internal Temp & Humid Sensor(GMS-120)Temperature: -20℃ ~ 70℃Humidity: 10% ~ 90%RHExternal Temp & Humid Sensor(GMS-120E)Temperature: -20℃ ~ 80℃Humidity: 1% ~ 99%RHExternal Temperature Sensor(GMS-120E)Temperature: -40℃ ~ 120℃3) Resolution Temperature: 0.1℃Humidity: 1%4) Accuracy Temperature:±1 (℃ 0℃ ~ 80 )℃ , ±2 (℃ -20℃ ~ 0 )℃Humidity: ±3%5) Setting DIP Switch▪ Sensor number 1, 2, … 8, [ 9, 10(A) … 16(G) ]▪ Transmission Interval 1min, 2min, 5min, 10min▪ Temperature High Limit 10 ,℃ 12℃ … 38 ,℃ 40℃▪ Temperature Low Limit -10 ,℃ -8℃ … 18℃, 20℃6) Radio Specification▪ Frequency 426.075MHz7) Power Supply 2 AA Size Alkaline Battery8) Battery Life 6 Months9) Operating Range -20℃∼80℃10) Dimension 134mm(H) x 100mm(W) x 25mm(D)11) Weight 198gm(including batteries)