The Yogasleep Rohm is a portable white noise machine that effectively cancels out disturbing noises for better sleep and concentration. It offers three soothing sounds to choose from, and its volume can be adjusted from whisper-quiet to impressively robust. The Rohm is compact, lightweight, and portable, making it easy to carry in a bag or backpack. It can operate all night long on a single charge and comes with a convenient USB cable for recharging. However, this sound machine is intended for portable use and must be turned off and unplugged every 14 days.