The CR300 must have the Wi-Fi option built in. With the Hydro-Link interface already applied to the data logger, all the web pages of the interface reside on the logger. Now the CR300-series datalogger with the Wi-Fi option will host the interface web pages to any device that has Wi-Fi capabilities, including smartphones. On the smartphone, under the settings for the Wi-Fi, connect to the CR300. After the connection is made, open the browser and enter the IP address, normally 192.168.67.1.