The ObusForme Sound Therapy System uses therapeutic qualities of natural sounds to provide you with peaceful relaxation in any setting. Features * Choose from six quality sounds of nature: ocean, summer night, rain, rain forest, waterfall, and heartbeat * Timer to turn off after 15, 30 or 60 minutes * Compact & Lightweight for travel * 110V A/C adapter included * Battery option allows for portability (4 AA batteries, not included)