The TandD TR-71NW is a two channel temperature logger that comes with two external temperature sensors. Choose from recording on two external sensors or one external sensor and one internal. Recorded data can be automatically sent via a wired LAN (Ethernet) connection and viewed from anywhere using the free cloud based TandD WebStorage Service. Program high and/or low alarms and receive an email notification if there is an alarm event. There are 15 available sample rates to choose from ranging from 1 second to 1 hour and the logger can store up to 8,000 readings before needing to be downloaded to your computer or uploaded to the cloud service. Logger can be powered via the USB cable using the supplied AC adapter or powered over Ethernet (PoE). A single AA battery serves as a backup to power the logger between 10 days to 1.5 years (depending on Auto-upload interval) in the event of a power failure. The TR-71NW is designed for indoor applications and can be used in environments from -10°C to 60°C. The external temperature sensors can monitor temperatures from -40°C to 110°C.