Technical parameters: Frequency Range :740-790MHz (default) 615-655Mhz (need 1 week for customizing) Oscillation mode: PLL frequency synthesizer (PLL) Frequency stability: ± 10ppm Receiving Mode: superheterodyne double conversion Receiver sensitivity:-90dBm Audio Frequency Response :40-18000Hz Harmonic Distortion: ≤ 0.5% Signal to Noise Ratio: ≥ 100dB Audio output: independent and mixed unbalanced output :10-30mW transmit power Modulation: Frequency Modulation (FM) Battery Specifications: two on the 5th battery Power Specifications :100-240V 50-60Hz (switch power adapter) Package includes: (1) 2x Handheld Microphone , (2) 1x Wireless Microphone Receiver (3) 2x Antenna (4) 1x 1/4" plug Audio Cable (5) AC-DC adapter ( 110V or 240V universal ) (6) Rack fixed Angle iron

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