More buying choices 18 39 4 used new offers. Skip to main content. Soneic Sleep Relax And Focus Sound Machine 10 Soothing White Check the instruction manual of your chosen model for information about ideal placement. Battery operated sound machine . Parents say this is a major plus and a hard to find feature among white noise machines. Some sound machines need to be placed outside the room you re in to mask ambient noise but others can stay in the room as normal. If you want to use your sound machine while you travel a battery powered option offers greater portability and convenience. With a rechargeable internal battery auto off timers and clear speaker quality there s a lot to like about this portable little unit. Get it as soon as fri jun 5. Battery operated white noise sound machine benefits and reviews. A wide variety of battery operated sound machine options are available to you such as 1 year. Nowadays the white noise sound machines are becoming popular wor...