They each have a precision keyboard and a full control surface powered by a brand new version of Novation's Automap control software - Automap 4 (which makes getting hands-on with your DAW/plug-ins fast and simple). 

Impulse also has 8 back-lit drum pads which can warp arpeggios, roll beats and launch clips in Ableton live. Features: Precision Keyboard: Ultra-responsive semi weighted keyboard with aftertouch. 

Full DAW/plug-in control surface: 8 knobs, 9 faders and buttons (1 fader & button on Impulse25) and a custom LCD screen. 

Automap 4 control software: Enables instant hands-on access to your DAW and plug-ins. Multi-function drum pads: Warp arpeggios, roll beats and launch clips in Ableton Live.