Features: Signal stability,long-distance receiving has strong anti-jamming ability, stable signal and.  Distance,receiving distance of 30-100 meters.  No noise： Constant frequency, high-quality middlehead + high-quality sound filtering system, fundamentally solve the problem of screaming.  No distortion,strong pickup, clear voice, high efficiency anti-noise, 0 delay to make the whole voice smooth and undistorted.  Tunable,wide range of equipment support applications, as long as the device with microphone interface, can be connected to use.     Specification: Silent control:Lock Noise;  Frequency offset:±11kHz;  Frequency response:80Hz-15kHz;  Frequency stability:±0.005%;  Signal to noise ratio:>60dB;  Distortion:0.5% (1kHz);  Number of channels:two channels;  Sensitivity:-70dB M;  Use distance:50 meters in the open area;  Receiver power supply:DC 12V/320mA;  Transmitter power supply:AA battery;  Frequency range:200MHz-270MHz;  Output mode:independent and hybrid automatic selection;  Launcher: Frequency stability: ±0.005%;  Carrier output power: ≤30mW;  Spurious emission suppression: >40dB;  Modulation method: vhf;  Maximum modulation: ±75KHz;  Pickup mode: (capacitive) (LWM-6188/C);  Receiver: Receive sensitivity: 40dB;  Audio output impedance: 600Ω;  Audio output level: 0-0.5V;  Use power: AC220-240V 50/60Hz;  Power consumption: 1W;     Note: This product does not contain batteries.  Two AA batteries need to be purchased by yourself.  They can be bought at the local hardware store.     Package Included: 2 x Microphone;  1 x Receiver;  1 x Audio Wire/Antenna;  1 x Charging Cable;  1 x 6.5m to 3.5m Audio Interface