Wirele handheld microphone system(1 Receiver + 1 Microphone) for karaoke, party, DJ, busine meetings, speech or other outdoor & indoor activities. Adopts VHF frequency band(channel A:228.9MHz), strong anti-interference.A/D and D/A are used for audio of 24Bit/48KHz; Using the ID code + frequency to encrypt the data to the frequency, which enhances the connection stability.With automatic mute and shock elimination circuit to avoid the impact and noise of the switching; extremely high pick-up sensitivity and excellent tone quality make your speech or singing more clear.The wirele transmiion distance is about 20 to 30 meters.Material: plasticSystemOscillator: DSP chip frequency lock Carrierfrequency band: VHF (228.9MHz)Digital audio transmiion technologyUnique digital ID code pilot technology, ID code 32bit, completely solve the same frequency crotalk phenomenon.Ultra low audio delay.Audio sampling mode: 48KHz.Frequency range: 50Hz - 18KHz.Receive automatic scanningOpen environment theory transmiion distance: 20-30 meter Microphone type Picking up way heart pointingFrequency range 228.9MHzRF bandwidth 60MHzTransmitting power 10mWFrequency response 50Hz - 18KHzDynamic range 96dBHarmonic radiation <-50dBcDistortion <0.1%Power supply mode One 1200mA lithium battery (3.7V) Package List: 1 * Microphone1 * Receiver1*Rechargeable lithium battery2* microphone drop ring1 * USB Cable1 * 3.5mm Converter1 * Users' Manual