Frequency Range	615MHz-655MHz
Bandwidth	2X25MHz/4X15MHz
Modulation	Frequency Modulation (FM)
Oscillation mode	PLL (digital frequency synthesizer)
Speech pick-up head	Moving coil
Signal to Noise Ratio (S/N)	> 105dB (A)
Distortion (1 Khz)	<0.2%
Spurious suppression	≥90dB
Mirror suppression	≥90dB
Sensitivity	0dBuV
XLR output jack	250mV/600 Q
Unbalanced output (1/4"output jack)	400mV/K3 Q
Frequency stability	< 10ppm
Audio Frequency Response	50Hz- 18KHz
Dynamic range	> 100dB (A)
Working distance	150 meters(ideal environment)
Battery Specifications	2 (15V) AA alkaline batteries
Power Specifications	100-240V 50-60Hz (switch power adapter)

AD-4 Wireless Microphone Feature

- UHF 600MHz band, phase-locked loop (PLL) frequency synthesizer
- Infrared frequency, automatic synchronization lock the transmitter frequency
- The receiver automatically scans and locks the current environment is best to use free channels.
- Superheterodyne double conversion design, with a high receiver sensitivity
- Multi-level high-performance surface acoustic wave filters, with excellent anti-jamming capability
- Mute circuit specially designed to completely eliminate the microphone turned on and off the impact of noise
- Microphone dual step-up design, the battery down does not affect the transmit power
- The ideal environment for an operating radius of 150 meters, used in a variety of high demand occasions

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