 class="parameter ">observer<span class="token operator">: </span><a href="../../com.amazonaws.services.chime.sdk.meetings.device/-device-change-observer/index.html">DeviceChangeObserver</a></span></span><span class="token punctuation">)</span></div><p class="paragraph">Adds an observer to receive callbacks about device changes.</p><h4 class="">Parameters</h4><div class="table"><div class="table-row" data-filterable-current=":amazon-chime-sdk:dokkaHtmlPartial/release" data-filterable-set=":amazon-chime-sdk: