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circuit Frequency Response 45 Hz to 18 kHz Amplifier 90 Watts RMS Sound Pressure Level 94 dB, 1 Watt @ 1 Meter Power Sources 100-240 volt AC universal power supply, two 12 volt (sealed and maintenance-free) lead acid batteries included Wireless System Transmitter 16-channel UHF wireless, 740-801MHz, PLL, 300’ range Receivers Two 16-channel UHF wireless, 740-801MHz, PLL, internal antenna, on/off volume control, Audio & Radio Frequency receiving LED, 150’ reception range from mics (handheld wirele