Main Features‎:‎‎- Double channels design‎,‎ can use two handheld wireless microphones without interference at the same time‎.‎‎- High precision quartz crystal to lock the frequency‎.‎‎- High sensitivity and high S/N ratio‎,‎ high fidelity without noise‎.‎‎- Superior selectivity‎,‎ multi‎-channel can use at the same time‎,‎ do not interfere with each other‎.‎‎- Suitable for studio / karaoke / radio / etc‎.‎‎- Ideal environment for using distance is up to 50 meters‎,‎ complex environment and practical distance is 30 ‎- 40 meters‎.‎System Parameters‎:‎‎- Carrier frequency range‎:‎ 220 ‎- 270MHz‎- Frequency response range‎:‎ 60Hz ‎- 16KHz‎- Harmonic interference‎:‎ more than 90dB‎- Radio frequency stability‎:‎ plus or minus 0.005 percent‎- S/N ratio‎:‎ more than 90dB‎- Output intensity‎:‎ 0 ‎- 400mv‎- Harmonic distortion‎:‎ less than 0.5 percent‎- Microphone is powered by 2 x AAA battery ‎(‎ not included ‎)‎‎- Microphone dimension‎:‎ 260mm x 30mm x 30mm‎- Receiver dimension‎:‎ 110mm x 45mm x 15mm