Mk-2 37 Mini Keys Keyboard Piano, Portable Small Keyboard With 40 Songs,, Black Portable Keyboard Piano: It has 37 mini keys, suitable for kids or teenagers with small fingers. It is small and easy to carry, which is very suitable for players who like to play the piano while traveling or on the sofa Rich Sounds Music Styles: It has 40 songs, 200 sounds and 200 rhythms built in, covering a variety of instrument sounds and rhythm styles. It also has transpose and octave functions, which allows the piano to play notes on more than 37 keys, with a wider range of musical expression capabilities Multi-function Music Keyboard: This small keyboard has multiple modes/functions: volume control, LED display, chord, sustain, metronome and various combination functions. In addition, it has a 3.5mm headphone jack, so you can connect headphones to enjoy wonderful music MIDI Function: It has USB-MIDI transmission function, you can connect it to a computer to try to make some demos or small productions. Or connect it to a mobile phone (or other devices) to play piano games Fingering Exercises: MK-2 electric keyboard has the function of simulating weighted keys, when you strike the keys harder, higher volume will be produced. This function is very useful for beginners to practice the intensity of piano Two Power Supply Methods: The mini keyboard piano can be powered by batteries and requires 4 AA batteries (Note: The set does not include batteries). In addition, it can be powered by USB, plug and play