Countersurveillance technologies
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Ultrasonic microphone jammers

Portable ultrasonic microphone jammer SEL-310 Komar
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Portable ultrasonic microphone jammer SEL-310 Komar
SEL-310 "Komar" is a small size microphone (including mobile phone microphones) and audio recorder jammer for personal use that helps secure sensitive audio information during conversations at meetings indoors, in the open air, or inside a car. It can be easily and quickly deployed in a car interior, on a table in a meeting room, or camouflaged inside a modified messenger bag, briefcase or purse.
All-round ultrasonic jammer SEL-360
All-round ultrasonic jammer SEL-360
SEL-360  is a small size microphone (including cell phone microphones) and audio recorder jammer with round-shaped jamming pattern for use on top of or under tables, desks or similar surfaces during meetings.
Ultrasonic microphone jammer SEL-324B
Ultrasonic microphone jammer SEL-324B
SEL-324B  is a high-power microphone (including cell phone microphones) and audio recorder jammer integrated into a common loudspeaker case.  
Thin semicircle ultrasonic jammer SEL-324V
Thin semicircle ultrasonic jammer SEL-324V
SEL-324  is a thin, small size microphone (including cell phone microphones) and audio recorder jammer with semicircle-shaped jamming pattern for deployment in environments with complex geometry: under desks and tables, inside automobiles, and other.  
Ceiling ultrasonic microphone jammer SEL-324A "Speaker"
Ceiling ultrasonic microphone jammer SEL-324A "Speaker"
SEL-324A "Speaker" is a high-power microphone (including cell phone microphones) and audio recorder jammer integrated into a common ceiling speaker case, intended for manual installation primarily above desks and tables in meeting rooms.  
Built-in ultrasonic microphone jammer SEL324S Spot
Built-in ultrasonic microphone jammer SEL324S Spot
SEL-324S "Spot" is a high-power microphone (including cell phone microphones) and audio recorder jammer integrated into a common ceiling LED spotlight case, intended for manual installation primarily above desks and tables in meeting rooms.