The Casio Privia Px-160 Electronic Piano is an 88-key digital piano that uses Casio's AiR (Acoustic and intelligent Resonator) sound source to provide grand piano sounds. The AiR engine delivers the sound of a 9-foot concert grand piano that has been recorded at four dynamic levels. The AiR engine also simulates damper resonance for a more realistic experience when using the damper pedal.