M-Audio 9900-52140-00 Mid Air Mid Air- Wireless MIDI Transmitter and Receiver SystemBring your MIDI gear into the wireless age with the MidAir system. Comprised of a portable transmitter and receiver, the MidAir allows you to wirelessly transmit data from any device that outputs MIDI data&mdash,keyboards, drum machines, electronic drums and more. Just plug the battery-powered transmitter into the MIDI Out port on your controller of choice and connect the receiver to the MIDI In port on the device you&rsquo,d like to control, and you&rsquo,re set. As a 2.4 GHz wireless device, the MidAir enables you to interface MIDI hardware at distances up to 30 feet with the same feel and response as a wired unit. The MidAir receiver includes a USB port and functions as a class-compliant 1 x 1 MIDI interface, so you can also wirelessly control soft synths from your favorite MIDI controller.