In Stock. The PZM-11 presents a low-cost solution for security and surveillance applications. Mounted on a standard wall plate, the PZM-11 doesn't look like a microphone but rather an ordinary light switch. Intelligibility is excellent, with low frequencies below the voice range rolled off to reduce the pickup of HVAC rumble. Electronics on the rear of the plate offer screw terminals, eliminating the need for connectors. The PZM-11 uses 12-48 volts phantom power, while the PZM-11LL features line-level output and is powerable by 12-24V DC or 24V AC.