Set of 2 sound machines. Great for travel, nursery and parents bedroom, caregiver, etc). Plugs included. Can also run on battery. Get the rest that you need with the help of the HoMedics SS-2000 Sound Machine. When you are fatigued, it is designed to give you the calm you need. This relaxing white noise machine has multiple features, giving you a customized experience each time. Turn it on to create a comforting environment with six different nature-based noises. Choose from Thunderstorm, Rain, Ocean, Brook and more. This Sound Machine Spa portable is battery or AC adapter operated, so you have versatility in your use. The sound machine is specially constructed with a built-in timer that automatically turns off when you want it to. The slim, lightweight construction makes it simple to take with you on the go. The Silver and White color fits will complement any bedroom or nursery.