... to carry,waterproof, foldable,anytime and anywhere you can play it. Zhongkai International 61 keys ... songs that you can play along with and learn. The lights up the key that is being played so that you know ... the piano and a great way to memorize songs. Standard 61 Simulation Keys,Sustain function, Vibration ... function, 10 Demo Songs,100 tone colors,100 rhythms,8 drum ...