High performance, covert telephone jack style, Omni-directional, pre-amplified microphone for fixed location security applications. 25’ pickup pattern in all directions. Built in limiter circuit automatically lowers the output level during loud sound intervals. Selectable Hi cut and low cut filters significantly reduce background noise. ABS enclosure mounts on any surface. Connects directly to our switcher / mixer / amplifiers or use one of our many interface products to make fast and clean connections to DVRs, IP cameras and remote monitoring equipment

Features:

• Omni-directional 25’ pickup pattern.
• One functioning RJ jack
• Low noise MOSFET pre-amplifier.
• 500Hz-16Khz Frequency response.
• Switch selectable hi-cut/low-cut filters limit frequency response to 900-6khz significantly reducing background noise.
• Switch selectable volume range: "Line level" (0db) or "Microphone level" (-30db) 
• Adjustable gain in both volume ranges.
• 100 Ohm unbalanced output.
• Internal peak limiter circuit (.5 sec response)
• 3 position Terminal block.
• Reverse polarity protected
• Power: 12 to 24VDC @ 10mA.
• PTCC fused and reverse polarity protected
• On-board voltage regulator and RFI filtering.
• S/N ratio: more than 60DB
• Sensitivity –45DB
• Industrial temperature range –40 to 85C.
• Dimensions: L 4.5” W 2.7” H 1.8”
• Weight .09lbs

Includes:

• SM1-RJ Surface mount microphone.
• Warning label.
• Installation instructions.

Options:

• See Pre-amplifier board selection guide for alternate pre-amplifier form factors.
• Add –LN to P/N for ultra low noise (80db) and high sensitivity (–28db) microphone capsule 

Wiring requirements:

• 2 conductor shielded (with drain wire) 22 gauge stranded. Max cable length 1000’