Feature: -Wireless handheld microphone system(1 Receiver + 2 Microphones) for karaoke, party, DJ, business meetings, speech or other outdoor & indoor activities.  -Adopts VHF frequency band(channel A:256.9MHz; channel B: 253.4MHz), 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 wireless transmission distance is about 20 to 30 meters.     Specifications: Material: plastic + metal;  Oscillator: DSP chip frequency lock Carrier;  frequency band: VHF (256.9MHz, 253.4MHz);  Digital audio transmission technology;  Unique digital ID code pilot technology, ID code 32bit, completely solve the same frequency crosstalk phenomenon.  Ultra low audio delay.  Audio sampling mode: 48KHz;  Frequency range: 50Hz - 18KHz;  Receive automatic scanning;  Open environment theory transmission distance: 20-30 meters;  Microphone type:  Picking up way heart pointing;  Frequency range 256.9MHz, 253.4MHz;  RF bandwidth 60MHz;  Frequency points 2;  Transmitting power 10mW;  Frequency response 50Hz - 18KHz;  Dynamic range 96dB;  Harmonic radiation Distortion <0.1%;  Power supply mode One 1200mA lithium battery (3.7V);     Package List:  2 * Microphones;  1 * Receiver;  1 * Rechargeable lithium battery;  2 * Microphone drop rings;  1 * USB Cable;  1 * 3.5mm Converter;  1 * User Manual