The device's primary function: This device is used to help relax, sleep, or focus by playing soothing natural and ambient sounds. OSIM is originally famous for its massage chairs and wellness products, and this device was sold as an accessory to provide a complete relaxation experience. Sounds include: • Ocean Surf sounds • Rain sound • Forest or bird sounds • Calming Zen music Condition: Works well Runs on 4 AA batteries Shipping is the buyer's responsibility