UHF Wireless Microphone 50 channels kit of 4 PU-228 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 kinds of interference. IR synchronization. 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 the LCD screens, which can display the working frequency and synchronize to the right IR frequency. The operation is simple, straightforward and convenient. Two 1.5V batteries used in the microphone, the battery life is long. Independent balance and unbalance mix output in the receiver, it is convenient to connect all kinds of audio equipment. The working distance is more than 60 meters. Both the receiver and the transmitter are made of high-strength alloy, so they are sturdy and durable. Microphone for conferences or other occasions. handheld, lavalier and headphone can be chosen to match the handset to meet the requirements of different occasions. Technical specifications Frequency range: UHF 620-950MHz Frequency response: 40Hz-18KHz Frequency stability: ± 0.005% Modulation mode: broadband FM Modulation range: 25 MHz Total channels: 4X50 channels Working distance: 60m Channel spacing: 250KHz Dynamic range: 100dB Maximum deviation: ± 45KHz AF Response: 65Hz-15KHz (± 3dB) THD : < 0,5% Audio output balance: 0- ± 500mV Receiver Power supply: AC 100-240V, 50 / 60Hz DC adapter output power: 13-15V, 500mA Power Consumption: 5W S / N ratio:> 98dB P / N Ratio:> 80dB F / N ratio:> 80dB Receiving sensitivity: 5dBu Microphone Frequency oscillation mode: PLL Transmitter power: high 30Mw, low 3mW Modulation mode: FM Tunable Bandwidth: 50MHz Frequency range: 250KHz Maximum deviation: ± 45kHz Harmonic radiation: <-55dBc Battery voltage: AA 1.5V × 2 Battery life: 8-10 hours Items included 4 UHF microphones Power cable for receiver 1 audio cable with 6.35mm Jack Antennas