Cellphone Audio Jammer Box AJB-331

Model: AJB-331
Cellphone Audio Jammer Box to Block Recording

General Configuration

✔Jamming Method: Ultrasonic Mixing Technology
✔Safe & Senseless: No audible noise or electromagnetic radiation
✔100% Block Recording on All Android phone and iphones
✔Indicators: Jamming Active, Wireless Charging
✔Wireless Charging Power Consumption: Max.10W
✔Only block phone’s microphone, not block phone network communications
✔Ideal desktop audio recording jammer for personal office and private space
✔Capacity for 1 phone use

Chat with iSecus on Whatsapp

Description:

Using Advanced Ultrasonic Mixing Technology, AJB-331 cellphone audio jammer box can block recording from cellphone eavesdropping seamlessly and senselessly without causing any disturbance.

By emitting ultrasonic wave that is imperceptible to the human ear, this audio jammer box can effectively jam the microphone of cellphones. Communication audio cannot be recorded nor restored.

Key Features of Our Audio Jammer Box:

◆ 100% Protection: The audio jammer adopts ultrasonic microphone jamming technology that effectively neutralizes any eavesdropping apps on the cellphone by emitting a meaningless noise.

◆Safe and Undisturbed: Thanks to ultrasonic microphone jamming technology, there is no audible noise or electromagnetic radiation. This technology does not damage cell phone hardware, nor does it block any calls, SMS, or other network communications.

◆ Easy to Use: It offers an out-of-the-box experience and activates upon placing a cell phone on it. It also has indicators for jamming activity and wireless charging.

◆Wireless Charging: The cellphone audio jammer box provides 10W wireless charging. Its optimized charging management and heat dissipation design allow for long working periods.

Specifications:

A Future-Ready Design

The design of the AJB-331 was fundamentally guided by the growing size trend of modern smartphones. We understand that professional security should not be compromised by device evolution. Therefore, the internal slot of the AJB-331 (173mm x 86mm) has been meticulously engineered to provide ample and reliable protective space for the largest flagship smartphones on the market today and in the foreseeable future.

Mainstream Flagship Smartphone Compatibility List (As of September 2025)

To visually demonstrate the broad compatibility of the AJB-331, we have compiled a list of the latest and largest flagship models from major international brands currently on the market. As the table below indicates, all of these devices can be accommodated with ease.

（Note: The phone dimensions listed above are based on public official data and are for reference only. Actual dimensions may vary slightly depending on the measurement method.）

Ultrasonic Mixing Technology

Based on CPLD/FPGA Chip embedded with encrypted algorithm, it generates ultrasonic mixing data model and exports ultrasonic signals, forming a harmonic effect to deceive the recording device. The microphone/pick up can only receive the harmonic ultrasonic signal generated by jammer, can not pick up the normal voice signal.

Safe, Silently and Undisturbed

Unlike a traditional loud noise jammer blocker, our device uses ultrasonic microphone jamming technologies. There is no audible noise or electromagnetic radiation. This technology does not damage cell phone hardware, nor does it block any calls, SMS, or other network communications.

Wireless Charging

The cellphone audio jammer box supports 10W wireless charging function. Its optimized charging management and heat dissipation design allow for long working periods.

Easy to Use

AJB-331 cellphone audio jammer box offers an out-of-the-box experience. It will activate upon placing a cell phone on it. There are LED indicators for jamming activity and wireless charging.

The AJB-331 is an ultrasonic audio jammer designed to protect your private conversations from phone recordings. Using advanced ultrasonic mixing technology, it disrupts both built-in and third-party recording apps, rendering any captured audio as noise and can not be recovered. Compact and portable, the AJB-331 safeguards your privacy against eavesdropping in any setting—whether at work, during business meetings, or in personal conversations.

Usage Instructions:

1. Power On: Connect the jammer to a power source (no built-in battery). The red charging indicator will light up.

2. Positioning: Place your phone on the center of the device to activate anti-recording protection.

Confirmation: A brief tone will sound when the jammer is active and functioning correctly.

Key Target Customers:

1. Corporate Executives & Board Members

• Need to safeguard strategic discussions and sensitive decision-making processes
• Regularly participate in meetings involving undisclosed financial data and market-sensitive information

2. Law Firms & Legal Professionals

• Handle privileged client information and confidential case details
• Must ensure attorney-client privilege remains protected in conference room settings

3. R&D Teams & Innovation Departments

• Discuss pre-patent innovations and intellectual property
• Require protection against competitive intelligence gathering and corporate espionage

4. Government Agencies & Officials

• Process classified but non-top-secret information
• Need to balance transparency requirements with sensitive information protection

5. Financial Services Professionals

• Must comply with financial regulatory requirements
• Discuss investment strategies and confidential client financial information

6. Home Office & Private Study

• Requires a compact, discrete solution to protect personal conversations.
• The perfect audio jammer for home use without taking up desk space

More Options:

• Looking for a secure solution for business meetings? Check out our [Dual Phone Recording Blocker (AJB-332)] or our [4-Phone Ultrasonic Jamming Box (AJB-336)].”

Download

AJB-331 Cellphone Audio Jammer Box Datasheet
AJB-331 Cellphone Audio Jammer Box User Manual
Audio Jammer Collection Catalogue from iSecus 2024

Chat with iSecus on Whatsapp

• • Q1: How many smartphones can the AJB-331 audio jammer box hold?
    • A1: The AJB-331 is designed as a personal office/home solution and perfectly accommodates one standard-sized smartphone (including large models like iPhone Pro Max or Samsung Galaxy Ultra). If you need to secure multiple devices, consider our dual-phone (AJB-332) or multi-phone (AJB-336) models.
  • Q2: Does this jammer box make any loud or annoying noise?
    • A2: No. Unlike traditional white noise jammer blockers, the AJB-331 uses advanced ultrasonic technology. It emits silent interference that overloads the phone’s microphone, ensuring your conversation remains completely private without disturbing your environment.
  • Q3: Is AJB-331 working on the latest iPhone?
    • A3: Unlike some similar phone boxes that have limitation from iPhone 6 to iPhone 14, iSecus AJB series audio jammer box can block the latest iPhone 16 to iPhone 17 series. By adopting our advanced Ultrasonic Mixing Technology & Algorithm, it can easily block the eavesdropping Apps from taking illegal audio recording.
  • Q4: Do you offer OEM?
    • A4: iSecus is the original supplier of the AJB Cellphone Jammer Box. Yes, we offer OEM service to distributors and projects partners. MOQ is 50 pcs.