AKAI Professional LPK25 MKII, Laptop Keyboard Controller, 25 Velocity sensitive mini keys, Buttons for octave selection, sustain, tap tempo, arpeggiator and special functions, Arpeggiator with 7 play modes, 8 bar measures and adjustable swing, Internal synchronisation with Tap Tempo (30 - 240 BPM) or external synchronisation via USB-MIDI, 8 Programmes can be saved, Plug'n'Play operation without driver installation, Power supply via USB-B port, Dimensions (W x D x H): 348 x 102 x 38 mm, Weight: 450 g, Incl. USB cable and MPC Beats Music Production software with drum samples and plug-in instruments