Description from Amazon USA :
The Rock Jam RJ-654 54-Key Digital Piano Keyboard is perfect for aspiring pianists of all ages. This compact, portable, and high quality keyboard has built-in stereo speakers and a large, easy-to-read LCD screen, which serves as a great teaching tool. It addition, the super kit comes with 30 free JoyTunes Piano Maestro songs that can be downloaded to an iPhone or iPad and that will help aspiring musicians learn and practice sight reading, rhythm, technique, two-handed playing, and much more. Song list is below. Select one of the 8 pre-installed demo songs and the LCD will indicate the correct chords and keys to play. While learning, players can record up to 41 notes. The RJ-654 comes equipped with a selection of 100 rhythms, so you can find the perfect beat to accompany the music you play. You can alter the sound of the piano too; choose from one of 100 included tones to produce different sound effects with the same keys. Use the sustain or vibrato buttons to prolong the sound of each note or add a trembling effect. Or play to a completely different beat and choose from one of 8 percussion sound effects, including the snare drum. The digital keyboard is compact, yet features sturdy keys, providing a "real piano" feel. Pianists also have the option of connecting the keyboard to external speakers when playing at a large venue. Players can also plug an electret microphone (not included) into the keyboard so that they can sing along with the piano. The keyboard's sturdy music stand will easily support your sheet music, an iPad, or Android tablet, so your hands are free to play. The keyboard can be powered by either wall power or 6 x 1.5V D batteries, making it easy to use both at home and on the road. To activate this app with your RockJam, download Piano Maestro on your iPad and register as a new user. Then, go to Settings , Select Your Piano , and choose RockJam from the dropdown menu. The free songs will be available in the Library.