Ultrasonic portable voice recorder jammer in power bank

Portable Ultrasonic Voice Recorder Jammer in a Power Bank is a compact device designed to provide protection against unwanted recording of conversations using voice recorders, mobile phones, and other devices equipped with microphones. It uses ultrasonic interference that affects the microphones of recording devices and can significantly reduce the intelligibility of recorded speech. It is particularly suitable for business negotiations, meetings, consultations, and other situations where sensitive or confidential information is discussed. A major advantage is its discreet design resembling an ordinary power bank. The device features a built-in 6000 mAh Li-Ion battery, offers two power levels, F1 and F2, and can also be controlled using a 433 MHz remote control. The maximum declared coverage angle is up to 300°. The jammer can also function as a power bank with a 5 V / 1000 mA output. With dimensions of 140 × 65 × 22 mm and a weight of 260 g, it is also easy to carry. The device does not produce voice prompts or conventional audible alerts; however, its interference signal should not be described as completely inaudible. During active ultrasonic interference, particularly sensitive users may perceive a slight high-frequency tone or noise.

Main advantages of the portable ultrasonic voice recorder jammer

• Ultrasonic microphone interference
• Protection against unwanted recording of conversations
• Two power levels: F1 and F2
• Maximum coverage angle up to 300°
• Maximum declared sound pressure level of 120 dB at a distance of 30 cm
• Built-in 6000 mAh Li-Ion battery
• Up to 10 hours of operation in F1 mode
• Up to 5 hours of operation in F2 mode
• Power bank function
• 433 MHz remote control
• Remote control range from 1 to 20 m
• Compact dimensions
• Metal construction
• Easy to carry

Ultrazvukové rušenie mikrofónov nahrávacích zariadení

Ultrasonic interference with recording device microphones

The primary function of the device is to generate ultrasonic interference that affects the microphones of voice recorders, mobile phones, and other devices designed to record audio. The purpose is to disrupt the recorded signal so that the resulting recording of a conversation becomes less intelligible or practically unusable.

The actual effectiveness may depend on the distance and position of the recording device, the orientation of its microphones, the microphone design, and the selected power level of the jammer. Therefore, it is not appropriate to claim that every type of recording device will be completely blocked under all conditions.

Ultrasonic interference may also not be completely inaudible to every user. During active operation, a slight high-frequency tone or noise may be perceptible, particularly in quiet environments or to people who are more sensitive to high frequencies.

Two power levels F1 and F2

The ultrasonic jammer offers two operating levels, allowing the output to be adjusted according to the specific situation. In F1 mode, the current consumption is approximately 500 mA, with a declared battery life of up to 10 hours.

The more powerful F2 mode has a current consumption of approximately 800 mA and a declared operating time of approximately 5 hours. The higher output is suitable for situations where more intensive interference is required, although it naturally increases power consumption.

The maximum declared sound pressure level of the interference signal is 120 dB at a distance of 30 cm, while the maximum coverage angle is 300°. These values represent technical parameters of the interference signal and should not be confused with the conventional sound volume perceived by the user.

Remote control with a range of up to 20 metres

A practical feature of the device is the 433 MHz remote control. Its declared operating range is approximately 1 to 20 metres, depending on environmental conditions.

This allows the jammer to be controlled without having to hold it during a meeting or negotiation. Thanks to its power bank design, it can be discreetly placed on a desk or conference table.

Its compact dimensions also make it easy to carry in a bag, briefcase, or luggage, allowing the device to be used not only in the office but also during business trips.

6000 mAh battery and power bank function

The device is equipped with a built-in 6000 mAh rechargeable Li-Ion battery. Depending on the selected mode, it provides approximately 10 hours of operation in F1 mode or approximately 5 hours in F2 mode. A full charge takes approximately 8 hours.

The design also allows the device to be used as a power bank. The output voltage is 5 V, with a maximum declared output current of 1000 mA, allowing compatible electronic devices to be powered or charged.

By combining a voice recorder jammer with a power bank, the device maintains a discreet appearance while also providing a practical additional function for everyday use.

Technical specifications

• Device type: ultrasonic audio recording jammer
• Jamming technology: ultrasonic microphone interference
• Material: metal, electronic components
• Battery capacity: 6000 mAh
• Battery type: rechargeable Li-Ion battery
• Charging voltage: 5 V / 1000 mA
• Output voltage: 5 V / 1000 mA
• Standby current: 14 mA
• Current in F1 mode: 500 mA
• Current in F2 mode: 800 mA
• Shutdown current: 60 μA
• Charging time: approximately 8 hours
• Operating time in F1 mode: approximately 10 hours
• Operating time in F2 mode: approximately 5 hours
• Maximum sound pressure level of the interference signal: 120 dB at a distance of 30 cm
• Maximum coverage angle: 300°
• Remote control: 433 MHz
• Remote control range: 1–20 m
• Operating sound: during active ultrasonic interference, a slight high-frequency tone or noise may be perceptible
• Power bank function: yes
• Dimensions: 140 × 65 × 22 mm
• Weight: 260 g

Package contents

1 × Ultrasonic voice recorder jammer in a power bank

1 × USB-C power cable

1 × Remote control

1 × User manual

Recommended accessories

For regular use, we recommend a suitable 5 V / 1 A USB power adapter, which allows convenient charging of the built-in 6000 mAh battery. For business trips, a protective case can also be useful for safely carrying the device and its accessories.

Portable Ultrasonic Voice Recorder Jammer in a Power Bank is suitable for users who want to increase the protection of confidential conversations against unwanted audio recording. It offers two power levels, remote control, a 6000 mAh battery, up to 10 hours of operating time, and a practical power bank function. When using the device, it should be taken into account that although it uses ultrasonic technology, active interference may be perceived by some users as a slight high-frequency tone or noise.