Zentara GT-ZERO

GT-ZERO is a hardware device designed to prevent audio eavesdropping in meeting rooms and similar physical spaces. It emits a randomly modulated acoustic signal in a narrow band spanning audible and ultrasonic frequencies (25.5-26.5 kHz), which physically interferes with microphone elements, causing resonance and distortion at the point of capture. This means any device attempting to record the room - including audio recorders, phone or laptop microphones, hidden recorders, and covert listening devices - captures unintelligible noise instead of speech. The device operates above the range of human hearing, so it does not disrupt normal conversation in the room. It functions as a standalone physical-layer countermeasure with no network connectivity, requiring no configuration once switched on. GT-ZERO provides 360-degree coverage with a guaranteed protection radius of up to 2 meters, and can run on battery (12V, up to 2 hours) or mains power (230V AC, up to 5 hours). It is portable and intended for use in executive suites, negotiations, and off-site meetings. The product is part of a broader Zentara product family that includes GT LONG (extended-range version for larger conference tables), M7 (a frequency sweep device for detecting listening devices), and a professional TSCM (Technical Surveillance Countermeasures) sweep service. Direct hardware purchase is currently pending import and distribution licensing in Indonesia; the unit is otherwise available through Zentara-deployed engagements.