Rohm Travel Sound Machine
"Block out disruptive noises for better sleep or concentration wherever you are with the Rohm White Noise Machine. USB-rechargeable and perfect for on-the-go use, the Rohm lets you take control of your sound environment anywhere. At just 3.8 ounces, it easily fits in any carry-on bag, backpack, or diaper bag, and includes a lanyard for convenient hanging.