Nighty Night Owl Smart Sensor Sound Machine SMWL050922 1 Glow in the Dark Size:Small (13 18lbs) 1 Glow in the Dark smart watch The generously sized Key Features: Plays 4 Soothing Sounds and 4 Peaceful Melody Options: Mother's Heartbeat Twinkle Twinkle Spring Showers Rock a Bye Baby Ocean Surf Classical Lullaby Whale Songs Tranquil Melody Responds and restarts its soothing sounds when baby vocalizes Three sound sensitivity levels to adjust the sensor to environmental noise Restarts from the last melody played at the same sound level last selected Adjustable volume Scientifically proven to promote better sleep Two sleep timer options with auto shut off: 23 and 45 minutes Velcro tab for easy attachment to baby’s crib Super soft polyester plush Removable white noise machine Can be machine washed and dried when sound machine is removed Requires 2 AA batteries (included) Recommended for ages 0+ it plays soothing sounds at bedtime