Birth & up. Vibrations soothe baby to sleep. Breathing & heartbeat imitate closeness to mom or dad. Close & comfortable: imitates closeness to mom or dad with the sounds & feelings of breathing & heartbeat. Soft & huggable: starts with a gentle squeeze from your little one. Designed to be safe for in-crib use. Easily turns on with a squeeze. Soft pulsing vibration matches with heartbeat & breathing sound. 20 minute auto-off. 3 Modes of Comfort: 1. Heartbeat & breathing sounds. 2. Heartbeat & breathing sounds with pulsing vibrations. 3. Pulsing vibrations. Requires 3 AAA batteries (included). Colors and styles may vary. Summer Infant stands behind all of its products. If you are not completely satisfied or have any questions, please contact our Consumer Relations Team at 1-401-671-6551 or www.summerinfant.com/contact-us. Conforms to ASTM F 963 - Standard Consumer Safety Specification for Toy Safety. www.summerinfant.com. We love our customers! Get to know us at: www.summerinfant.com. Made in China.