The Baby Brezza Smart Soothing Mattress is the first mattress of its kind to help your baby fall asleep by mimicking the sounds and movements of the womb, which triggers natural soothing reflexes and stimulates sleepiness. Use the free Bluetooth app to operate it, and customize the settings to your baby's preferences by choosing from four vibration intensities, four heartbeat patterns and five timer settings. It features an easy-to-clean waterproof liner and a removable, machine-washable polyester-spandex blend cover, and it runs on four AA batteries (sold separately). The Baby Brezza Smart Calming Mattress is lightweight and easily rolls up for transport. In addition, its dimensions allow you to use it in a crib, in a bassinet or on an activity mat. Baby Brezza's smart soothing mattress. A revolutionary mattress that soothes your baby and helps him sleep better! Features: -Helps baby calm down and sleep -Reproduces the sounds and movements of the mother's womb -White noise that produces a soothing effect on the nervous system -8 settings for vibration and heartbeat -Easy to use - with the FREE app (or buttons on the mattress): switch on and off, select vibration intensity or setting for heartbeats, set timer, check charge batteries -Bluetooth compatibility -5 timer settings: 15, 30, 45, 60 minutes or continuous operation -Water resistant interior -Removable silky poly-spandex cover -Rolls up for easy transport -No weight limit -Battery powered (requires 4 AA batteries, not included) Product dimensions: 30 cm x 60 cm x 1.6 cm (12 in x 23.5 in x 0.75 in) Product weight: 481g (1.1 lbs)