HA130 is a compact and flexible headphone monitor amplifier. It features with two direct balanced XLR inputs and one 1/8’’ headphone output, you can switch-over from stereo to mono-mix by the handy stereo/mono switch on the panel. You also can adjust the volume by the control knob. It power by 9V block battery or from a DC adaptor. HA130 is housed in sturdy aluminum case, stable and durable. The two foam pads which raise the resist falling capability of headphone amplifier in a way. HA130 is easy and convenient to use and a good choice for musicians.