They are powered by an included small power supply or by six AA batteries; they also come with a stereo speaker system plus a headphone output jack for quiet practice. More experienced pianists may replace the included sustain pedal with Casio's SP-34 three-pedal portable model and there are the optional CS-46P wooden stand and SC-800 carrying case available.

Both models have bright backlit LCD displays, a trio of MIDI jacks, a USB port that will work with Macs or PCs--even your Android or iOS devices with no driver needed. Super fun is the free Chordana Play For Piano for iOS/Android App. You can easily customize the keyboards, learn new MIDI songs, playback audio files with pitch/tempo control and view PDF scores.

The CDP-S150 includes a stereo grand piano plus nine other tones with adjustable effects and temperament and a one-button recorder for capturing performances. It sells for $479.99 MSRP. The CDP-S350 at $549.99 MSRP has 700 sounds, 200 accompaniment rhythms, a pitch-bend wheel, a six-track MIDI recorder with USB storage, and convenient "Registration" buttons to save/recall sounds and settings.