Ads are typically automatically played when a visitor loads a web page.
Most commonly initiated via JavaScript, audio ads normally cannot be stopped once they start.
Audio ads vary in length, and a website visitor will usually hear only one advertisement per visit to any specific web page.
[2] Mixberry Media launched a form of PPP allowing audio enabled web sites and mobile applications to request targeted audio ads in real time.
[3] This method takes advantage of "dead space" or loading time, serving audio ads while the user is waiting for audio output, gaining their focused attention.