PR-700M Single-Channel Handheld Wireless Microphone Systems are the best solution for presentation applications such as demonstration, lecture, speech or worship. With the built-in selectable 16 preset frequency mechanism, it is allowed to operate up to 6 PR-700 simultaneously (location dependent). Regarding interference prevention, PR-700 adopts PLL (Phase-locked loops) synchronization, auto mute and other advanced technologies and features a 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.