Studiologic Acuna 88 Lightweight Hammer Action Keyboard Controller for Use with iPads, 88 Keys Perfect iPad integration using the Acuna CPanel App 88-key FATAR TP/100 Premium Weighted Hammer ActionMonophonic Aftertouch, 3 factory velocity curves 4 programmable layers, 2 midi ports separately assignable, 4 assignable encoders USB midi port compatible with iOS 4; 2 Housed in a solid metal casing