CME WIDI-X8 - world's first duplex wireless MIDI system with transmission range up to 80mtrs (in environments without obstructions), low power consumption, high-speed, error correction ability, built-in USB MIDI interface. Operates on 2.4GHz ISM license-free band, duplex MIDI transportation (MIDI in/out), Up to 64 adapter pairs can be operating at the same time. 64x working channels can be selected manually or automatically, flexible connection of MIDI and USB ports. Three modes can be selected (USB RF/MIDI RF/USB MIDI), plug-and-play USB MIDI on Windows XP and Mac OSX. Powered via 2x AA batteries (battery life up to 20 hours) or via USB bus power.