Chromecast devices are dongles that are powered by connecting the device to an external power adapter or USB port using a USB cable. Video-capable Chromecasts plug into the HDMI port of a high-definition television or monitor, while the audio-only model outputs sound through its integrated 3.5 millimeter audio jack/mini-TOSLINK socket. By default, Chromecasts connect to the Internet through a Wi-Fi connection to the user's local network. A standalone USB power supply with an Ethernet port allows for a wired Internet connection; the power adapter for early Chromecast models was first introduced in July 2015 for US$15,[11] while the adapter for Chromecast with Google TV was released in October 2020 for US$20.[12]