PR-750 Dual-Channel Wireless Microphone Systems are perhaps the simplest solution for live presentations such as demonstrations, lectures, speeches, worship services or live dramas where two presenters or lecturers are required. With the built-in selectable 16 preset frequency mechanism, it is allowed to operate up to four PR-750 (allowing for 8 performers / lecturers / speakers in total) simultaneously (location dependent). And regarding interference prevention, PR-750 adopts PLL (Phase-locked loops) synchronization, auto mute and other advanced technologies and features an output level switch (-6 / 0 / +10), mode switch (separated / mixed), channel-independent RF/AF indicators and volume knobs to offer a intuitional worry-free and plug-n'-play user experience and make every presentation and show perfect.