... 2.Customized sounds and design are welcome3. Suitable for children's sound book or toys4.Standard sounds:music, animals,vehicles, ... peope,etc.IC duration: 80, 120, 210 secNumber of buttons: 10,14,30,33 etc.Type of ... when pressing the relative pictures Functions: For children's educational books, enrich children's knowledge and enhance their interesting of studyFor language ...