wireless microphone, uhf dual metal handheld dynamic mic system with rechargeable receiver, 164ft range, for karaoke,party, speech, wedding, meeting, pa system (red and gray) wolfun uhf universal wireless microphone manual a.features: 1.frequency range:uhf frequency (channel a and channel b) 2.use 24bit/48khz high performance audio special a/d and d/ processor 3.use id code+frequency for frequency match encryption.(although two receivers are using the same frequency, the receiving chip is interfered by rf signal .it only will affect the working distance it will not cause noise.) 4.has auto mute and impact eliminating circuit to avoid impact and noise while turn on/off the unit. b.technical specification 1.frequency range: huf frequency 2.frequency channel: 16 channels, id code is changed random. 3.oscillation mode: dsp chip frequency lock 4.frequency stabillity: +10ppm 5. frequency power: 10dbm 6.frequency response: 40-18khz 7.distortion:¡ü0.5% 8.battery:1.5v/aa size 9.working hours: 4-8 hours. 10. frequency range: 530-570mhz 11. use range: 30-50 meters c. receiver specifications: 1. frequency range: high frequency 2. frequency channel: 16 channels, the id code changes randomly. 3. oscillation mode: dsp chip frequency lock 4. frequency stability:¡à10ppm 5. receiving sensitivity-95~-71dbm 6. frequency response: 40~18khz 7. signal to noise ratio: 290db 8. audio output: 300mv(maximum)