Micro SD Card-Powerful Function Twelve Tunes preloaded in the memory cards(please note that it plays just a part of the song, not the entire song): 1) IT IS A SMALL WORLD 2) FRERE JACQUES 3) BRAHMS LULLABY 4) TWINKLE LITTLE STAR 5) MARY HAD A LITTLE LAMB 6) SCHUBERT'S LULLABY 7) MOZART'S LULLABY 8) LA LE LU 9) OLD MACDONALD HAD A FARM 10) ROCK A BYE BABY 11) LET ME BE YOUR TEDDY BEAR 12) HUSH, LITTLE BABY Install it on baby crib/bed with arms/bracket, hang toys overthe hooks. The toys will rotate while music playing. Turn On/Off: Long press the left red button for 3 seconds. Play/Pause: Short press the left red button. Loop Single song /Loop Playlist: Short press the right red button. Music/Rotation Separation Switch: Long press the right red button for 3seconds. Previous track: Short press the left green button. Next track: Short press the right green button. Volume down: Long press the left green button for 2 seconds. Volume up: Long press the right green button for 2 seconds. Specification 1.Product Dimensions(L*W*H): 3.5in*3.5in*1.38in 2.Product Weight: 4.37oz 3.Color: White 4.Micro SD Card Capacity: 128M(12 tunes included) 5.Power Source: 2 AA batteries(not included) 6.Support USB Data Transmission: YES 7. There are 12 tunes already preloaded before shipping, you can download anyother music or audio stories at you will via USB cable. Benefits 1.Light music helps your baby easier fall asleep 2.Music may even help strengthen prematurebabies 3.Music plays a crucial role in `wiring` yourbaby`s brain for learning. 4.Listening to music will help teach your infantabout patterns and sequence, and about rhythm, beat and tone which are usefulfor problem-solving and reasoning. 5. Early music exposure can help promotecritical listening skills, language and literacy, creativity and coordination Note Brackets/arms and toys are not included but available in the market. Package Included 1x Baby Musical MobileMusic Box 1x 128M Micro SD Card 1x USB cable(for data transmission) 1x User Manual