SOOTHING VIBRATION SYSTEM: Baby crib mattress with built in vibration mat for baby featuring 3 gentle modes and 3 timer settings of 15, 30, or 45 min. Designed to create a calming sleep space without adding a separate vibration machine baby crib device. TWO STAGE DESIGN: Dual sided toddler crib mattress offers a firmer infant side and supportive toddler bed mattress surface. 201 steel coils and reinforced edges help maintain shape and stability as your child grows. REMOTE CONTROL ACCESS: Includes soft touch remote to adjust vibration levels and timers from across the room. Built in baby soothing vibration pad is powered by included batteries for convenient nighttime comfort. BREATHABLE WATERPROOF COVER: Cotton cover is soft against delicate skin and features a waterproof barrier to help protect the baby bed mattress from spills. Wipes clean easily with mild soap and air drying. SECURE STANDARD FIT: Measures 52 x 28 x 5 in. to fit most full size cribs and toddler beds. Tight top innerspring baby mattress meets ASTM safety standards and provides a snug fit to help support safe sleep practices.