A standalone device refers to a gadget or tool that can function independently without needing to connect to other devices or systems. It works on its own without relying on additional equipment or networks. Full definition
What's the best standalone device with a camera and microphone that I can use without having to go out and buy a camera - enabled smart TV? (engadget.com)
There are also concerted efforts to bring VR to a larger and more mainstream audience, including mobile options built around smartphones, like the Oculus - powered Gear VR and Google's Daydream View, as well as standalone devices based on mobile SoCs like the Oculus» Go, Mi VR, and Santa Cruz HMDs; Lenovo's Mirag Solo; and HTC's Vive Focus. (tomshardware.com)
One area in which Siri is lacking is in standalone devices like smart speakers, such as Google Home and Amazon Echo. (cultofmac.com)