... ROLL up electronic piano Standard 37 Keys,8 rhyhm keys, 8 sound effects keys, 22 Demo ... piano EP-K37DRelevant Parameters :1. pucker punction of electronic keyboard2. 37 standard keys3. 6 Demonstration songs4. 8 tone colors5. 8 rhythms6 ... .W.: 12.7KGS G.W.: 13.7KGS Roll up Piano [37 keys]