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: What does the flashing light mean on the power indicator? At Home: I am pressing the control buttons on the front of the product and nothing is happening. What should I do? At Home: Does the SlumberCalm™ 2-in-1 Sound Machine & Night Light need to be plugged in to use it?