Description: Dual Channel UHF Pro Wireless Microphone Equipped with 16 non-interfered frequency channels Freq Setup:    Select the channels of receiver at rear panel, then       press IR button of receiver.    Move forward the IR part of handheld microphone       at front panel of receiver to automatically sync       the freq & locks to the same channel as receiver. Carrier Frequency Range: 700 - 900MHz Oscillation Mode: PLL (Phase-Locked Loop) synthesized Frequency Stabilization: < ± 30ppm Dynamic Range: ≥90dB System Distortion: ≤0.5% Frequency Response: 40Hz - 15kHz Audio Output Level:400mV (Balanced&unbalanced) Squelch Control: Adjust from rear panel (distance) Operating Range: Approximately 60M Signal To Noise Ratio: ≥80dB Operating Temperature: 5ºC - 45ºC AC Power Supply: AC100~240/45-60Hz DC Power Supply: 17V Spurious Emission: > 40dB (with Carrier) Battery Voltage: 1.5V (1 x 1.5V AA Battery)                              (per handheld microphone) Battery Life: Appx 5 hours, subject to battery quality Rack Mount: Half 19” design, two systems can be                        connected for 19” rack (Optional) Sets Per Carton: 10 Sets