Garrett MS-3 Z-Lynk Wireless Headphones, with Built-In Z-Lynk Receiver and Included Transmitter for High-Fidelity Audio. 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. USB charging cable included. Speaker impedance: 8 ohms Frequency response: 30-18,000 Hz.