FOR SALE IS ONE (1) USED AND TESTED GOOD ROLLS MB15 PROMATCH WITH AC ADAPTER MPN MB15 MANUFACTURED BY ROLLS INCORPORATED. USA MADE, GENTLY USED, TESTED PERFECT, IN GREAT COSMETIC CONDITION, USED LITTLE. THIS EARLIER MODEL OF THE ROLLS MB15 PROMATCH DOES NOT PROVIDE 3.5mm INPUT AS FEATURED ON LATER MODELS (mb15B) OF THE PROMATCH DEVICE. THIS ROLLS BRAND MB15 ProMatch WILL CONVERT CONSUMER LEVEL STEREO RCA SIGNAL TO BALANCED XLR PROFESSIONAL LINE LEVEL, AND BACK. ONE SIDE OF THE UNIT, LABELED 1, HAS TWO XLR INPUTS AND STEREO RCA OUTPUTS. THE OTHER SIDE LABELED 2, HAS STEREO RCA IMPUTS AND TWO XLR OUTPUTS. EACH SIDE HAS STEREO LEVEL CONTROLS, AND AN LED INDICATES THAT POWER IS APPLIED FROM THE AC ADAPTER (included) TO THE PROMATCH UNIT. THE MB15 WILL ALSO ACT AS A BALANCED XLR LINE LEVEL CONTROL. BY ADDING A STEREO PAIR JUMPER BETWEEN THE FOUR RCA JACKS (connecting ins to outs), THE TWO LEVEL CONTOLS MAY BE INSERTED INTO ANY BALANCED XLR LINE. THIS DEVICE WORKED GREAT FOR ME, CONVERTING A DESKTOP PC UNBALANCED AUDIO SIGNAL (consumer grade) TO A BALANCED AUDIO SIGNAL (professional grade) REQUIRED BY MY MIXER. YOU WILL RECEIVE ONE (1) USED ROLLS MB15 AND AC ADAPTER, EXACTLY AS PICTURED SHIPPED BY USPS MAIL..... Specifications ROLLS MB15 ProMatch with AC Adapter, gently used, tested good, excellent cosmetic condition, exactly as pictured, Max Out: Balanced: +18 dB, Unbalanced: +12 dB Max In: Balanced: +22 dB, Unbalanced: +22 dB Input Impedance: RCA : 100k Ohm, XLR: 10 k Ohm, 1/8? stereo: 10k Ohm Output Impedance: RCA: 100 Ohm, XLR: 100 Ohm balanced Noise Floor: -88 dB Gain: +4 dB In: -8 dB, -10 dB In: + 20 dB THD: .003% Power: 12 VDC adapter (center negative) Size: 4.15? x 2.46? x 1.55? BID AND BUY HERE IN IN ABSOLUTE CONFIDENCE SINCE I HAVE THOUSANDS OF POSITIVE FEEDBACK AND TEN+ YEARS EXPERIENCE. I SHIP WITHIN TWO DAYS OF RECEIPT OF PAYMENT, OFTEN THE NEXT DAY. $4.81 USPS GREEN SHIPPING USING RECYCLED PACKAGING MATERIALS AND ENVIRONMENTALLY FRIENDLY MATERIALS TO ANYWHERE USA. I DO NOT SHIP ANYWHERE ELSE. HAVE A GREAT DAY AND THANK YOU FOR STOPPING BY......