Features: Professional VHF wireless dual channel microphone system, with amplifier function. Built-in BT function for connecting Smartphones, Tablets, and Laptops, very convenient to enjoy Karaoke or give a speech at any occasion. High quality sound, good anti-noise solution. Wireless microphone effective working range up to 50m / 164ft in open-area. Small size and light weight, easy to carry around. With independent volume control knob for channel A and B, 6.35mm MIX out.