Inkbird Smart Sensor Data Logger Temp RH Monitoring Temperature Humidity Recorder Bluetooth Wireless Thermometer Hygrometer Monitor for Android iPhone ONLY Inner Sensor NO External Probe Attention: Since the upgradation of SDKSoftware Development Kitto the latest version 26,it is necessary to launch the GPS to tag your position for scanning bluetooth device,which are applicable to the version starting from 23. Monitoring range: 50 meters / 150ft (No obstructions).Temperature Range: -40 ~140F . Humidity Range: 0~99%RH. Accurate (Humidity and Temperature accuracy is 2%RH and 0.5F) and fast response. Use the new generation of France HTU21D temperature and humidity sensors. Power consumption will be lower and working life will be longer. History and Immediacy data can be remotely checked through Bluetooth. Hold data for 20 days if the sampling interval is 1min, the max date storage is 30000 point. Different sampling interval (10s, 30s, 1min, 2min, 5min, 10min, 30min) can be setting. The saving data time will be different if you choose different sampling interval. Multiple Devices Connecting : One mobile phone can monitor more than one sensor and one sensor can be monitored by more than one mobile phone. Support both C /F mode and with paster. Engbird app can be applied to IOS and Android system and support multi-language.