PreSonus Eris E3.5 Active Studio Monitor. It is a highly popular compact loudspeaker designed for music production, home recording studios, and desktop media setups.Key FeaturesDrivers: It features a 3.5-inch woven composite low-frequency transducer (woofer) paired with a 1-inch silk-dome high-frequency transducer (tweeter).Front Controls: The active left channel speaker features a convenient front-panel layout including a dedicated volume knob, 1/8" Aux input, 1/8" headphone output, and an illuminated power rocker switch.Performance: It delivers 50 watts of Class AB dual amplification (25 watts per side) for clear, accurate audio monitoring.