Marpac Hushh - White noise machineOur best selling white noise machine now comes as a portable sound machine! Can be held in the palm of your hand. Continuous white noise machine which can be used plugged in or with included rechargeable lithium battery. Hushh is charged and played using a Micro USB cable, the same way as you charge a phone. Run continuously and turn off using the on off button as required. There is no timer. Or run Hushh on the battery power. We've tested it to run