THS 1 Talkback Headphone BOX~Made in USA The Whirlwind THS 1 models of sports announcer boxes have single button mic controls. The THS 1M is Push to Mute. The microphone output of the THS 1 boxes is a passive, straight through connection. THS boxes are ergonomically designed to put the control buttons within easy reach of the announcer even while shuffling through stat sheets. The headphone amplifiers are designed to deliver powerful, undistorted audio that can be heard over an arena full of screaming fans. Description The THS 1 Talkback/Headphone boxes are configured with a single momentary switch to control the microphone output. The THS 1M has a Push to Mute switch. The microphone output of the THS 1 boxes is a passive, straight through connection from the microphone input. This ensures that the microphone will still be live on-air, even if power to the THS 1 is lost. A jack is provided for connection of an optional momentary footswitch to control the mic operation. For use with dynamic mics only. Headphone inputs consist of balanced left and right inputs on separate female XLR connectors. A single front panel volume control adjusts the level of both the left and right earpieces. Another balanced mono Aux input is provided which feeds left and right ears equally. The Aux input has it?s own volume control. Headphones with impedances ranging from 30 to 600 Ohms can be driven to full volume. Power is supplied by a 12 VAC power adapter, model # PS12AC1A, included with the unit. Features · Left and right balanced line level inputs with single volume control · Additional mono Aux input feeds both left and right ears · Balanced XLR input and output jacks · Microphone Control switches (PTT and PTM) are completely silent · OE? TRS or 3.5mm headphone jacks · PS12AC1A power adapter included 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 -Pro packed shipped USPS, UPS or Freight Service. Contact us pay for 2 day air upgrade on any unit. We are working hard to get your product ( built if needed), processed shipped. Processing times vary, 2-30 days Returns/Refunds- If there is truly a manufacturing defect a return tag will be provided. Otherwise customer pays for return shipping. Returned items must be sealed/unopened to qualify for a full refund. Refunds are for the Item cost only. Gear returned with out all its original packaging, accessories or shows signs of wear, is subject to an additional service fee. This item is now used and it would be unfair to resell to another customer as new. What products can not be returned? - International Sales Clearance items, Custom Builds, Road Cases, DT12 items, items identified as non-returnable, discontinued items, used or NOS items, electronic software downloads, demo gear, computers, vacuum tubes, earbuds, harmonicas raw-frame speakers, turntable cartridges, fog fluid