Create music anytime, anywhere with the IK Multimedia iRig Keys 2 MIDI Keyboard Controller Series. This collection includes the Keys 2, Keys 2 Mini, and Keys 2 Pro. You’ll receive a variety of 25 and 37 mini keys along with 37 full-size keys. All come with a USB power supply, or you can use the portable USB battery pack. So you don’t have to worry about connectivity issues. This MIDI controller also features a headphone output, so you can listen..