Portable: Does the SlumberCalm™ Portable Sound & White Noise Machine need to be plugged in to use it? June 11, 2024 19:07 No, the product has a built-in rechargeable battery and can be used anywhere once charged. Related articles Portable: Will the SlumberCalm™ Portable Sound & White Noise Machine fit in SlumberPod’s pocket? Portable: I am pressing the control buttons on the front of the product and nothing is happening. What should I do? Portable: What does the flashing light mean on the power indicator? Portable: How long does it take to fully charge the SlumberCalm™ Portable Sound & White Noise Machine? At Home: I am pressing the control buttons on the front of the product and nothing is happening. What should I do?