Found a fantastic little bargain on ebay while searching keyboards, it's a rock band midi keyboard.

For £7 delivered ( so of course I have five of them now ) it's a hardware midi keyboard run from batteries. 

Standard 5 pin din midi connector.

• 25 velocity-sensitive keys
• TRS port for stomp or expression pedals
• 1-axis touch strip which maps to modulation and pitch
• Three AA batteries

Full manual is Here!