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Key Product Benefits
Portability and power bank in one: The product features an integrated dual-function design combining ‘anti-recording jamming’ and ‘mobile charging’. The 8000mAh battery capacity is sufficient to support 4–5 hours of continuous recording jamming, whilst also providing emergency charging for digital devices such as mobile phones and tablets, with charging and discharging parameters of 5V/1000mA. With two functions in one device, there is no need to carry an additional power bank when travelling or attending meetings.
Remote Control: 1–20m Operation: Comes with a 433MHz wireless remote control, supporting remote activation and deactivation from up to 20 metres away. Users can activate the device in advance before entering a meeting room or private space to establish a sound field shield, eliminating the need to get up and operate the device mid-conversation.
Ultra-low power consumption and standby design: The F15’s standby current is just 14mA, and the current when switched off drops further to 60µA (60 microamperes). In other words, with a full charge, the device can theoretically remain on standby for dozens of days, and when switched off and left idle for a year, it consumes less than 0.5Ah of power. Users do not need to charge the device frequently; it is ready for use as soon as it is switched on.
Dual anti-recording mechanisms: The F15 interferes with the microphone modules of various digital recording devices, such as mobile phones, voice recorders, bugging devices and cameras, whilst also blocking audio content during video recording, providing comprehensive protection against video recording, mobile phone recording and voice recorder recording. The ultrasonic waves emitted by the device are effective against the vast majority of mainstream smartphones and recording devices available on the market.
300° Coverage + 13 Emission Ports: The three-sided output layout, combined with 13 concealed emission ports, creates a 300° wide-angle interference barrier. Compared to some devices on the market that only support single-sided 120° or dual-sided 180° interference, the F15 offers superior, dead-zone-free protection in small to medium-sized spaces.
Silent operation, no electromagnetic radiation: The device operates without any audible interference throughout its operation, causing no auditory discomfort to either party in a conversation. The device utilises a pure acoustic jamming method that does not rely on electromagnetic wave transmission, posing no risk to human safety or health.
Product Specifications
Parameter: Specification
Model: F15
Dimensions: 152 × 69 × 28 mm
Battery Capacity: 8000 mAh / 3.7V
Charging Voltage: 5V / 1000 mA
Output Voltage: 5V / 1000 mA
Anti-Recording Sound Pressure: 120 dB (maximum at 30 cm)
Shielding Angle: 300° (maximum)
Standby Current: 14 mA
Power-Off Current: 60 μA
Remote control method: 433 MHz wireless remote control
Remote control range: 1–20 m
Number of emitter ports: 13 concealed ultrasonic emitter ports
Compatible device types: mobile phones, voice recorders, video recording devices, bugging devices
Note: Some parameters are measured maximum values; actual performance may vary depending on the environment and the device used.
Core Technical Principle
Ultrasonic Mixing Interference Technology
The core technical principle of the F15 recording jammer is based on acoustic non-linear effects—specifically, ‘ultrasonic mixing technology’. The device is equipped with an ultrasonic transducer that emits ultrasonic waves of various frequencies (typically above 20 kHz) through 13 emitter ports. These ultrasonic waves propagate through the air and, upon demodulation, generate interference signals that are inaudible to the human ear but can be sensitively picked up by the microphones of recording devices. When the interference signal overlaps with normal conversation sounds within the recording device, it disrupts the microphone’s ability to sample the original sound signal completely, rendering the recording as an indecipherable “buzzing” noise.
Compared to traditional white noise jammers (which typically operate within the audible frequency range and generate noticeable ambient noise), the F15’s pure ultrasonic solution ensures completely silent operation, causing no auditory interference or discomfort to either party in the conversation. Its core operating frequency exceeds the limits of human hearing (20 Hz–20 kHz), posing no risk to human health and emitting no harmful electromagnetic radiation.
300° Multi-Angle Coverage Design
The F15 features 13 concealed ultrasonic emitter ports arranged across three sides of the unit. By emitting sound in three directions, it achieves a total coverage angle of 300°, maximising the shielding range and effectively minimising blind spots. This 300° coverage means the device can provide complete acoustic protection for long conference tables, round negotiation tables or multi-seating areas with a single installation, meeting the protection requirements of small to medium-sized conference rooms and business meeting rooms without the need for multiple units.
Silent Operation, Imperceptible Protection
When the device is in operation, the ultrasonic signal is completely inaudible to the human ear, allowing conversation partners to communicate naturally and without interference. In contrast, some low-cost, unbranded products employ a single fixed-frequency ultrasonic transmission scheme or audible white noise interference, which not only offers limited effectiveness but also tends to produce audible screeching or an uncomfortable sensation of ear pressure when operating in the high-frequency range. The F15 utilises multi-band ultrasonic mixing technology and power-optimised design to avoid these issues, achieving a truly silent jamming effect where ‘conversations can be heard, but content cannot be recorded’.
Explanation of the 120dB Anti-Recording Sound Pressure Parameter
A sound pressure level of 120dB (maximum at 30cm) is a key indicator of the jammer’s output intensity, demonstrating that the device can generate a high-intensity ultrasonic sound field at close range, providing ample power headroom for recording interference. Combined with an 8000mAh high-capacity battery, this parameter enables the F15 to maintain high output whilst ensuring extended battery life.
Application Scenario Matrix
The F15 anti-recording jammer is suitable for the following scenarios requiring high levels of confidentiality:
Business Negotiations: Scenarios such as business negotiations, contract signings, supplier meetings and client receptions. The device’s casing is designed to resemble a portable power bank, allowing it to be placed naturally on a conference table, office desk or coffee table without attracting attention, thereby avoiding any discomfort caused by an conspicuous device.
Boardroom Meetings: Confidential meetings such as internal strategy discussions, board decisions, project approval reviews and budget approvals. The 300° coverage meets the all-round protection needs of small to medium-sized meeting rooms (approximately 15–30 square metres).
Private Conversations: Conversations involving personal privacy, such as legal consultations, medical consultations, psychological counselling and family financial discussions. The device is portable and ready to use immediately.
In-Car Private Conversations: Scenarios involving sensitive information exchange during in-car negotiations or business transfers. The compact and portable device can be activated at any time whilst driving, unrestricted by the vehicle’s interior space.
Overseas Business Travel and Anti-Eavesdropping: Mobile scenarios requiring temporary privacy protection, such as hotel rooms, temporary meeting areas, and co-working cubicles. The 8000mAh power bank function simultaneously meets the charging needs of mobile phones and other devices.
Operating Instructions
Power On: Press and hold the power button on the side for 2 seconds; the display will light up and the device will enter standby mode.
Activate Jamming: Press the ‘Start’ button on the remote control; the 13 transmission ports will begin emitting ultrasonic jamming signals, whilst the display shows the current battery level and operating status.
Remote Control Range: The 433MHz wireless remote control has a range of 1–20 metres and offers strong penetration; it can be triggered without needing to be aimed at the device.
Power Adjustment: Depending on the size of the meeting room and the number of attendees, adjust the independent power knobs for the three-directional output (supported on some models) to suit different scenarios (2–5 metre protection range).
Power Bank Mode: Charge the device via the Type-C port, or use the USB output port to power external devices such as mobile phones.
Power Off: Press and hold the power button for 3 seconds; the device will enter standby mode, with a standby current of just 60uA.
Device Structure Diagram:
Power button → Battery level display → Type-C charging port → USB charging output port → Three-directional ultrasonic emitter array (13 ports) → 433MHz wireless remote control receiver antenna
Product Dimensions and Packing List
Product dimensions: 152mm (L) × 69mm (W) × 28mm (H)
Weight: Approx. 450g (including built-in battery)
Package Contents:
F15 Anti-Recording Jammer Main Unit × 1
433MHz Wireless Remote Control × 1
Type-C Charging Cable × 1
Packaging Box × 1
