> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes. # device$ > Observable for device capability ```ts get device$(): Observable ``` Observable for device capability ## device ```ts get device(): boolean ``` Current device capability ## **Examples** ```ts capabilities.device$.subscribe((device) => { console.log('device:', device); }); ``` > Observable for device capability