Digital Wireless Instrument Set. Ideal for applications requiring up to eight systems. 2.4 GHz digital transmission with license-free operation. Automatic Frequency Management continuously scans for interference. AFM Automatically changes frequencies if needed - on the fly. D1 systems detect each other and work together to assign and manage frequencies. Adaptive high-power transmission continuously checks wireless signal strength. Adjusts transmission power for consistent, reliable performance. D1 systems deliver up to 100 mW, which delivers generous usable working range. Automatic Sensitivity Adjustment automatically optimize input for maximum dynamics. Excellent sound quality that captures every nuance of your performance