Our MP3 Stereo Mobile features a combination of music, movement and lights that will calms your baby and develops your baby's senses, cognitive skills and emotional intelligence. Easy attachment mechanism fits most cribs and the mobile arm moves easily from side to side allowing easy access to your baby. Features: ?choose your baby's music! Let baby enjoy endless musical variety ?detachable take-along baby MP3 player ?8 pre-loaded classical melodies by Mozart, Schubert, Mendelssohn and more ?baby-safe MP3 compartment for uploading baby's favorite music using a USB stick (not supplied) ?light, mute & movement control ?easy, 3 step assembly ?with 3 soft, colorful characters and 3 prism balls