Primary function of the device: 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 this device is sold as an accessory to provide a complete relaxation experience (and it can be used separately). The sounds include: • Ocean Surf sounds • Rain sound • Forest or bird sounds • Calming Zen music Condition: Works well Runs on 4 AA batteries It also works with electricity, but the adapter is missing (adapters are available in the market). Shipping is the responsibility of the buyer.