Yamaha THR5 Features: An amazing portable guitar amplifier that's perfect for practicing, songwriting, and recording 5 excellent guitar amplifier emulation settings give you access to every popular tube amp style 4 modulation FX and 4 independent reverb/delay FX let you dial in a wide range of tones Yamaha's VCM technology delivers extremely realistic sound and feel Runs on supplied AC adapter or 8 AA batteries for up to 6 hrs. of continuous playing time 1/8-in. aux input lets you play back audio via your personal music player USB connection provides 2 channels of recording to your computer and 2 channels of playback from your computer 2 x 3-in. speakers provide stereo audio for internal FX and auxiliary/computer audio playback THR Editor software lets you tweak extra parameters of your amp models and FX settings, and access the onboard noise gate and compressor