Best Seller | ART HP-1 Personal In-Ear Monitor Amplifier HP-1 Free Express Shipping! ART HP-1 Personal In-Ear Monitor Amplifier High-Output Headphone Amplifier, Locking XLR-1/4" Input, 3.5mm Output, Balanced Mono / Unbalanced Stereo Switch, 40 Hours on Two AA Batteries, Variable Volume Control, Sturdy Belt Clip,... ... more ART HP-1 Personal In-Ear Monitor Amplifier HP-1 Free Express Shipping! ART HP-1 Personal In-Ear Monitor Amplifier High-Output Headphone Amplifier, Locking XLR-1/4" Input, 3.5mm Output, Balanced Mono / Unbalanced Stereo Switch, 40 Hours on Two AA Batteries, Variable Volume Control, Sturdy Belt Clip,... | | $59.99 FREE shipping go to store |