The best-selling Baby Einstein 4-in-1 Kickin’ Tunes Music & Language Discovery Activity Gym supports fine and gross motor skill development and cause and effect skills; grows with baby from 0 to 36 months 4 modes include lay and play, sitting up, tummy time, on the go; Helps baby strengthen neck muscles during tummy time; Piano includes 25+ minutes of continuous lights and music plus teaches colors, shapes, and numbers in 4 languages: English, Spanish, French, and German 7 sensory toys engage and promote fine and gross motor skills like reaching, pressing, and kicking; crinkle medallion, triangle rattle, textured music note, flash cards, self-discovery mirror, piano toy and tummy time pillow; features 2 toy bars and kick piano; supports visual development Baby registry \"must have\"; Piano rewards baby’s moves with 70+ melodies, sounds, lights, & phrases and can be used for tummy time or lay and play, flipped up for seated play, or detached for on the go Dimensions: 18 x 34 x 27 inches; If your gym comes with \"try me\" batteries, be sure to replace with 3 AA batteries to keep the fun going (not included); Mat is machine washable, toys are easy to wipe clean