Yes, an internet connection is essential for using a Slingbox. The Slingbox device is designed to stream live television and recorded content over the internet, allowing users to access their home media from virtually any location. This means that both the Slingbox unit at home and the device you are using to watch the content—such as a smartphone, tablet, or computer—must be connected to the internet. The quality of the streaming experience may vary depending on the speed and reliability of the internet connection. It is important to ensure that both your home network and the remote device have sufficient bandwidth to maintain a smooth viewing experience. For more detailed requirements or troubleshooting, users may wish to explore the information available on the Slingbox website.