Pyle Compact Stereo Headphone Amplifier W/DC 12V Power Adapter for Studio, Stage | Distortion & Noise-Free | Features +48V Phantom Power Pass, Dual Headphone, Microphone & Mic Thru Inputs (PHA211) ULTRA QUIET NOISE: The stereo headphone amplifier allows for convenient audio level & monitor mixing. Maintain premium sound quality for a distortion & noise-free performance. Features volume level controls. ULTIMATE CONTROL: The monitor headphone amplifier gives you control of two independent audio sources, a microphone and a connected monitor. Audio mode selectable between stereo and mono. COMPACT DESIGN: Portable with a small size of 4.1'' x 1.2'' x 2.2'' Weighs only .92 lbs, easy to carry and use on the road.Perfect for both on-stage & studio performances. FOR USE WITH MICROPHONES: The stereo amp features +48 V phantom power support enabling full support for microphone use. The unit also features XLR (3-Pin) microphone & mic thru inputs & dual headphone inputs: 1/4'' and 1/8'' (3.5mm). ADJUST INCOMING SIGNAL & MATCH LEVELS: The stereo amplifier features supreme gain adjustment capabilities. Greatly improve dynamic range with gain adjustment of up to 20dB/Channel.