Features of HP4:. Presonus HP4 4 Channel Earphone Amplifier Monitoring System. 4 High Power Earphone Outputs. Ultra loud (150mW per channel). Ultra peaceful operation. Musical Wide Dynamic Range. Control Room Monitor Outputs with Level Control. Mono or Stereo Operation. Monitor Mute Switch. Daisy Chain an Infinite Number of Units. Compact plan. Rockville RHB70 Compact all in one home theater speaker with 4" subwoofer and (2) 3" speakers integrated in. Integrated in SD sd card slot enables playback of audio stored on a sd card (approximately 32GB). RCA Aux input enables easy connection of a laptop, computer system, TV, phone, tablet, or any other audio device. LED display to see Volume, Track information, FM channels and other information. Convenient digital controls on front panel. Push-button control with direct track selection. Completely wooden enclosure for pure sound. Cherry wood enclosure finish. Frequency reaction: 40Hz - 20 KHz. Channel Separation: ? 50dB (1 KHz ). Output Power: 25 Watts RMS, 50 Watts program power, 100 watts peak power. Input Voltage required-- 110V A/C. Unit measurements (inches): 4.73" W x 9.65" H x 10.64" D. Unit Weight: 5.43 LBS. Delivering measurements in inches (with packing material):6.62" W x 12.41" H x 11.62" D. Shipping Weight: 6.31 LBS. Features of SASR350: Samson SR350 Over Ear Closed Back Studio Reference Monitoring Stereo Headphones. Light-weight design ideal for music recording, practice and listening. Powerful audio performance. Over-ear, closed back design with cushioned ear cups. 35mm drivers with unusual earth magnets. Adjustable padded headband. 20Hz-20kHz frequency variety. 1/4" adapter consisted of.