TOA PM-660U Desktop Paging Microphone, Unidirectional Polar Pattern, 600 Ohm Balanced Rated Impedance, -58 dB Rated Sensitivity, 100Hz – 10kHz Frequency ResponseDesigned for paging calls and general announcements, the PM-660U desk-top microphone comes with a large talk switch and a lock lever for easy and convenient operation. Its robust anti-vibration construction and balanced output render the microphone resistive to noise. In addition, the PM-660U microphone is equipped with a remote control switch (interlocked with the talk switch) for amplifier power on/off operation or chime activation.Key FeaturesLarge talk switch and a lock lever for easy and convenient operationRobust anti-vibration construction and balanced outputEquipped with a remote control switchPower on/off operation or chime activationSpecificationsType: Moving coil microphonePolar Pattern: UnidirectionalRated Impedance: 600 , BalancedRated Sensitivity: -58 dB (1 kHz, 0 dB=1 V/Pa)Frequency Response: 100 Hz – 10 kHzOutput: 5.0 (0.2″), 4-conductor (2-shielded) cable (2.5 m (98.43″)) without plugTalk Switch: 1-push-to-talk switch, 1-locking lever, Short-off typeRemote Control: 500 mA or less at 30 V DCFinish: Microphone head: Zinc plated steel wire, gray baked paint; Main unit: ABS resin, grayDimensions (WxHxD): 100 x 215 x 150 mm (3.94″ x 8.46″ x 5.91″)Weight: 440 g (0.97 lb) (cord excluded)