QFX M-336 is a wireless microphone system that allows you to connect two wireless microphones to your amplifier or karaoke system. It features a simple plug-and-play setup, with telescopic antennas on the receiver unit for enhanced signal reception. The microphones are powered by 9-volt batteries and offer a mobile range of up to 30 meters in good conditions. The system boasts a frequency range of 109-120 MHz, a frequency response of 100~1000Hz (+/- 3dB), and a signal-to-noise ratio greater than 80dB. Its working temperature ranges from 0 to 45 degrees Celsius.