WMS- 8121WIRELESS MICROPHONE FEATURE: UHF 800MHz band PLL frequency synthesized 96 applied channels with 300KHz channel space Dual tune true diversity receiver Twice mixer superheterodyne circuit Excellent SAW filter for RF and IF circuit Manufactured by SMT components and technics AA size batteries for microphone, supply time up to 10~30h Dual DC-DC step up circuit design for microphone Up to 300 meter operation distance in perfect environment SPECIFICATIONS Frequency range is 730~950MHz Selectable channels is96 Oscillation mode is PLL synthesized Frequency stability is ?0ppm Receive mode is Superheterodyne Diversity type is Dual tune true diversity Input sensitivity is -90dBm Audio response is 40~20000Hz T.H.D. at 1kHz is less than 0.5% Signal to Noise Ratio is more than 110dB Audio output is Balanced and Unbalanced RF power is 10~50mW Modulation mode is FM Battery requirement is 2?.5V AA size