> 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. # lock$ > Observable for lock capability ```ts get lock$(): Observable ``` Observable for lock capability ## lock ```ts get lock(): OnOffCapability ``` Current lock capability ## **Examples** ```ts capabilities.lock$.subscribe((lock) => { console.log('lock:', lock); }); ``` > Observable for lock capability