AP Models are Casio's Celviano Digital Piano's. Celviano products offer the sound and feel of a grand piano. They combine quality, style and technology in in a high quality beautiful traditional cabinet. Model AP-24 --88 Full-Size, Weighted (Hammer Action) Keys, HL sound source, 32-Note Polyphony, Touch response, 10 Tones, MIDI, 8 demo tunes, 2 pedals. (2X20W).