article_snippet.sent: Parametric speakers use ultrasonic waves to create a very narrow, audible beam, which should only be heard by one sleeper, allowing Parametric speakers partner to continue to doze.
article_snippet.sent: Wakē uses a parametric speaker (like a laser beam of sound) to deliver focused, soothing sounds that start quietly, and grow louder slowly as the light beam grows brighter,’ according to the device’s Kickstarter page.
article_snippet.sent: Wakē uses a parametric speaker, like a laser beam of sound, to deliver 'focused, soothing sounds that start quietly, and grow louder.
article_snippet.sent: Parametric speakers use ultrasonic waves to create narrow, audible beams.