The WK-200 from Casio is a portable electronic keyboard with 76 standard sized, piano-style keys. It comes with a vast array of 570 playable tones, 180 beats and rhythms, and 152 songs. There are built-in music lessons that can evaluate your performance, so you can gauge how you improve over time. It's an inexpensive, feature-rich instrument with a large, piano-like keyboard.
There are multiple reverb and chorus effects built into the WK-200 to sweeten the sound, and a metronome to help you stay in time. A USB port lets you connect to a computer to transfer MIDI data. A microphone input allows you to plug in and amplify your voice, and a standard mini-plug input lets you connect an MP3 player or CD player allowing you to play along with your favorite songs. The keyboard can operate via AC power or by 6 standard D batteries (AC adapter and batteries not included).