Whirlwind PA-1 Pro Headphone Monitor~power Source included Made in USA The Whirlwind PA-1 is a high output, low distortion, portable monitoring device suitable for critical listening in any professional audio environment. Description Use for: Headphone distribution systems. Sign language interpretation or language translation. (The superior sound quality will reduce ear fatigue when working over extended periods of time.) Adding headphone monitoring to any piece of audio equipment. Boosting weak headphone outputs in high SPL environments. The PA-1 accepts either balanced or unbalanced stereo, line level signals through parallel XLR and 1/4" TRS inputs. A switch changes the input connector configuration from separate balanced inputs to combination unbalanced (Tip/Pin2 = Left, Ring/Pin3 = Right) for accepting signals from sources such as headphone jack outputs. Powered by two 9 volt batteries that load into easy access drawers or with included external PS24 AC power supply. Echotone Music LLC is an experienced E-commerce Audio Visual Equipment dealer since 1998. We take pride in selling Pro Audio gear for musicians, sound engineers, production companies and broadcast applications. Shipping --Items are well packed and shipped USPS, UPS or Freight Service. Items purchased on Friday may not ship until Monday or until the projected processing period. We are working hard to get your unit Built ( if needed), processed and shipped. Processing Times do vary Returns/Refunds- If there is truly a manufacturing defect a return tag will be provided, otherwise customer pays for return shipping costs. Returned items must be sealed/unopened in original brand-new condition, showing no signs use such as mount marks, scratches, scuffs, or collateral material damage.. Items must also include all original packaging, manuals accessories or your return may be subject to a return handling charge. Refunds are for the Item cost only. If the item was listed as free shipping then the cost of the shipment will be deducted from the units original cost. Gear returned with out all its original packaging, warranty cards and accessories or that shows signs of wear from use, will be subject to an additional service/restocking fee. This item is now used and it would be unfair to resell to another customer as new. The following products cannot be returned - Clearance items, Custom Builds, items identified as non-returnable, discontinued items, used or NOS items, electronic software downloads, demo gear, computers, vacuum tubes, earbuds, harmonicas, raw-frame speakers, drumheads, drumsticks, turntable cartridges, fog fluids, software/sound ware.