... of Strings with color light Item No.:TXY163559Air Guitar PRO – Infrared Ray Instead of Strings with color light Sample size:21 ... the music player like, iPod, MP3, MMP, Computer, etc. “OUT” for Line-out to the Speaker, Amplifier, Headphone, etc.Built-in SpeakerVolume ControlPre ... with Two AAA BatteriesFunctions: Musical Instruments, Guitar PlayerAir Guitar PRO – Infrared Ray Instead of Strings