The Whirlwind THS 2 TalkbackHeadphone Box has a single microphone output controlled by a latching Mic OnOff switch and a momentary Cough switch The microphone output is a passive straight through connection from the microphone input This configuration ensures that the microphone will still be live onair even if power to the THS 2 is lost Works with dynamic mics only Headphone inputs consist of balanced left and right inputs on separate female XLR connectors Separate front panel volume controls adjust the level to the left and right ears Another balanced XLR Mono input is provided that feeds both left and right ears equally The Mono input has its 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. Talkback Headphone Box. Left and right balanced line level inputs with individual volume controls. Additional Mono input feeds both left and right ears. Balanced XLR input and output jacks. A red lamp indicates the Mic is on. Push to Mute switch is completely silent. 14 TRS or 35mm headphone jacks. PS12AC1A power adapter includedSpecifications. Weight 3 lbs