Details: Garrett MS-3 Z-Lynk™ Wireless Headphones Comfortable ear cushions and adjustable headband guarantee a comfortable fit for every head size. Features: Built-in Z-Lynk receiver. High-fidelity audio. Volume control. Adjust signal levels to suit individual hearing requirements and to enhance weak signals. Comfortable headband and ear cushions. Folds down for easy storage. Speaker impedance: 8 ohms Frequency response: 30-18,000 Hz. This wireless headphone system works with many models of metal detectors. You can use these headphones and transmitter if your metal detector has one of the following: 1/4" headphone jack 2-pin headphone jack such as that found on the Garrett AT Gold, AT Pro, Infium LS, SeaHunter Mark II, and ATX detectors. Is a Garrett wireless-enabled metal detector such as the Garrett AT Max or Ace Apex.