Product Description: U-4100 (600CH) year warranty dual-channel phase-locked loop PLL circuit design. UHF 600 frequency points PLL digital lock automatically select information function. First blue LCD static LCD screen. Interference, the functional design for KTV rooms (multi-channel) design use. Microprocessor controlled automatic selection information function, can automatically select the stronger of two antenna signal input, and no function of the general receiver compared to its higher signal reception, the use of distance, without receiving dead things from happening effectively avoid interruption or noise generated output. Adjustable wireless improve reception. Lockable control button. Technical parameters: U-4100 wireless receiver carrier frequency range 710MHZ --- 865MHz Frequency Oscillation Mode PLL loop total number of channels 600CH frequency response 50Hz --- 18KHz Working distance 200 feet width 24MHz carrier frequency stability of ± 5PPm ≤ 10KHz false Image Interference Ratio> 80dB Signal to Noise Ratio> 105dB (1KHz-A) Sensitivity-105dBm (12dB S / N AD) THD 110dB Stability ± 0.005% Modulation Deviation ± 48KHz Spurious <-60dBc RF output Power 10mW Power Consumption ≤ 100mA @ 3 V power supply UM3, AAA 1.5v × 2 Function Display LCD