Two wireless Handheld Microphones with balanced output. Multi-channel high band anti-interrupting wave;thereby eliminating interference successfully. PLL-synthesized fixed, working separately even if used even at the same time. Companding design to expand effective range. Eliminates feed-backs and noise and mostly reduces chance of interference. Perfect performance gear for church,musical concerts and many more. Operating Distance: 100 meters Frequency range: VHF170-270MHz Frequency stability: ± 30ppm