Elitech RCW-800 wifi Temperature and Humidity Data Logger Wireless Intelligent Remote Monitor A Combined external temperature and humidity sensor + 24/7 Monitoring, Alerts & Unlimited Historical Data. Multiple alarm modes(LED indicator, buzzer, email alert via Cloud Platform).Check-In From Anywhere! Set with rechargeable lithium battery.Keep running for at least 6 hours after power supply is disconnected. No subscription or fees! Transmit data by WIFI to our cold-chain cloud platform; export data or graph flexibly in multiple formats:PDF,EXCEL. Multiple Devices Connecting : One cloud account can monitor more than one device and one device can be monitored by more than one cloud account.