UHF wireless desktop microphone U-712H kit of 2 Features With the UHF high frequency band, there is less interference than the traditional one so that the transmission is more reliable. With PLL technology, you can choose 200 frequency channels, which makes it convenient to use multiple sets at the same time and avoid interference types. IR sync. Frequency synchronization technology, the transmitter frequency can be automatically received by the microphone. The signal is stable and the anti-interference ability is improved. The transmitter and receiver have LCD screens, which they can display the working frequency and synchronize to the right IR frequency. The operation is simple, straightforward and convenient. The working distance is more than 60 meters. Both the receiver and the transmitter are made of high-strength alloy, so they are robust and durable. Microphone connector: BNC, 50 Ohm Technical specifications Frequency range: UHF 500- 890 MHz Frequency response: 80Hz-18KHz Frequency stability: ± 0.005% Modulation mode: Wideband FM  Range of mod ulation: 25 MHz SNR: 100dB Total channels: 4X50 channels Working distance: 60 m Channel spacing: 250 KHz Dynamic range: 100dB  Maximum deviation: ± 45KHz AF response: 80Hz-18KHz ( ± 3dB) THD: 0.5%   Receiver  Mode: secondary conversion superheterodyne Frequency: 110MHz-10.7Mhz Sensitivity: 12 dB muv (80dBS / N) Sensitivity range: 12-32 dB Maximum output: + 10dBV Built-in spiral antenna Transmitter Antenna: Whip antenna  Output power: 30mW peak Power : battery (included) Battery life: more than 4 hours with 30mW, more than 8 hours with 3mW Included accessories Batteries Power supply with Italian plug Sponges for microphone 6.35mm audio jack cable