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Endoacustica Europe creates custom GSM listening device installations inside everyday objects, equipment and appliances, with the technical setup chosen to suit the object and your operating needs.
A GSM listening device can be integrated into many different objects and types of equipment. You can choose one of the available configurations or request a fully custom installation designed for your needs.
Integration into items commonly found on a desk or in an office, depending on the internal space and available power source.
Power: battery, USB or mains power.
Installation inside mains-powered equipment, when the object's design and structure allow integration.
Power: continuous 220V or internal power supply.
Configurations designed for vehicle use, with particular attention to audio quality, power supply, and microphone and antenna placement.
Power: battery or 12V vehicle system.
Compact solutions for objects without a permanent power source, with the battery selected to match the available space and required operating time.
Power: internal rechargeable battery.
You can provide the object you want us to use for the installation. Our lab checks technical feasibility before work begins.
Configuration: custom designed.
Can't find the right configuration? We can design a specific solution based on the object, size, power source, operating time and required technical features.
Build: on request.
Each installation can be configured around the chosen object and your operating needs. Our lab checks the available space, power source and required functions to identify the most suitable technical setup.
The communication module is selected based on the available network, the country of use and the features required for the project.
High-sensitivity microphones, including Knowles models, can be used. Their position and acoustic characteristics are selected to suit the object.
Compatible systems can include DSP processing to improve audio quality and reduce noise and interference.
The system can detect voices or sounds and, on supported models, automatically place a call to the configured number.
Some configurations can use motion or vibration sensors to control selected device functions automatically.
Compatible installations, especially vehicle setups, can also include GPS tracking.
Rechargeable battery, USB, 12V or 220V mains power options are selected based on the object and required operating time.
For battery-powered systems, battery capacity and size are selected based on the available space and required operating time.
On compatible models, the listening device can be temporarily switched off by SMS, with a timer for automatic reactivation. While it is off, the radio module remains inactive.
Technical configuration: not every function is compatible with every object or power source. Before production, Endoacustica Europe checks feasibility and recommends the most suitable setup.
Each installation is developed around the chosen object and required features. Before production, we check the internal space, available power, microphone placement and the conditions needed for reliable GSM or 4G communication.
You can choose an object offered by Endoacustica or send us your own. We check its size, internal structure and power options.
We define the GSM or 4G technology, microphone type, power source, operating time and any extra functions compatible with the installation.
Our lab integrates the components, plans the microphone and antenna placement and, when possible, keeps the object's normal functions unchanged.
Before delivery, we test operation, audio quality, network connection, power and all functions configured for the project.
Providing your own object? Before installation, our lab checks its technical compatibility. If the requested integration is not possible, we suggest an alternative with equivalent or more suitable features.
Our lab can modify objects, equipment and systems to integrate a GSM or 4G listening device. Each installation is designed around the available space, power supply, operating time and required technical features.
USB chargers and wall adapters can be assessed for the integration of compact GSM or 4G modules while, when possible, keeping the object's normal function.
Power: mains power with an optional backup battery.
Integrated setups can be designed for compatible cables and power systems, using miniaturized components and carefully planning the microphone, antenna and transmission module placement.
Power: mains power with a dedicated configuration.
Bags, cases and other accessories can be used to create custom portable systems. Our lab checks the internal space, required operating time and best component placement.
Power: internal rechargeable battery.
Home accessories with enough internal space can be considered for fully self-powered installations, with the microphone, GSM module and battery selected for the application.
Power: long-life internal battery.
A Bluetooth speaker can be modified to integrate a GSM or 4G listening device while, when technically possible, keeping the normal audio functions of the device. Our lab checks the internal space and integration of the microphone, antenna and transmission module.
Power: rechargeable battery, USB or internal circuit.
Custom GSM or 4G installations can be designed for cars and other vehicles, with component placement planned around the cabin, audio quality and the characteristics of the vehicle's electrical system.
Power: dedicated battery or the vehicle's 12V system.
Customization is not limited to the examples shown. You can suggest or send us an object, electronic device or another item to modify. The Endoacustica lab checks technical feasibility and can design the system around the GSM/4G module, microphone, DSP, antenna, power supply, battery life and sensors according to your requirements.
Integrating a GSM listening device inside an object is not just about finding enough room for the circuit. Component placement, casing materials, available power and the object's internal layout can directly affect audio quality and mobile network communication.
For this reason, every custom installation is planned by considering the microphone, antenna, GSM/4G module and power supply separately. The microphone must capture audio clearly without being overly blocked, while the antenna must be positioned with the object's materials and electronics in mind.
The position is chosen based on the object's structure, available openings and acoustic characteristics. Even a high-quality microphone can perform poorly if it is placed in the wrong location.
Metal parts, electronic circuits and other components can affect the radio signal. The antenna is therefore placed in the best position for the available configuration.
When the object has its own power source, we assess whether it can also power the GSM system. For portable devices, the battery is sized according to the available space and required operating time.
After integration, we test the power supply, mobile network connection, audio quality and all options included in the configuration.
The goal is to create a system where the object and listening device work as one solution, keeping the object's normal use whenever possible and delivering the agreed technical performance.
To assess a custom project, we need some information about the object and the features you require. Our technical team checks feasibility and recommends the most suitable configuration before production begins.
Tell us which object you want to use. You can provide the brand and model, send photos, or simply describe the type of device you are looking for.
Tell us which features you need, such as GSM or 4G, battery life, power supply, VOX, motion sensor, DSP, GPS or other available options.
Our lab checks the available space, power supply, materials and component compatibility to confirm whether the requested configuration is technically possible.
After the assessment, we define the technical solution and provide a quote based on the device and required functions.
After confirmation, our lab completes the integration and tests the power supply, audio quality, mobile network connection and included functions.
The system is delivered configured and tested. Endoacustica Europe also provides technical support for setup and use of the available functions.
Send us the brand, model and a few photos of the object, together with the functions you need. If you have not chosen the object yet, we can help you find a suitable option for the required configuration.
Yes. You can suggest or provide the object you want to use for the GSM listening device. Before production, the Endoacustica lab checks its size, internal space, materials, available power and compatibility with the required components. If the installation is not technically possible, we suggest an alternative.
Many everyday objects can be assessed, including office accessories, Bluetooth speakers, lamps, clocks, electrical devices, appliances and vehicle-related solutions. Feasibility mainly depends on internal space, power supply and the materials used in the object.
When the object allows it, the integration is designed to keep its normal functions. This is checked during the initial technical assessment and depends on the type of device and requested configuration.
Yes, when the project allows it. The technology is selected based on the country of use, available mobile networks, internal space and required functions. Endoacustica can then choose the most suitable module for the installation.
Depending on the module and available space, features can include VOX voice activation, DSP audio processing, motion or vibration sensors, GPS, remote configuration and an anti-sweep function. Not every feature works with every installation, so the final setup is defined during the technical assessment.
Battery life depends on battery capacity, the space available inside the object, the module used and how the system operates. When continuous power is available, such as 12V, USB or mains power, the system can be designed without relying only on the internal battery.
The cost depends on the chosen object, GSM or 4G module, power supply, microphone, required functions and the complexity of the integration. For this reason, custom installations are quoted after an initial technical assessment.
Contact Endoacustica Europe with the type of object, the functions you need and, if available, the brand and model. You can also send photos of the object. Our lab will assess feasibility and recommend the most suitable technical configuration before production.
Custom GSM listening devices are professional devices intended only for uses allowed by applicable law. The installation and use of listening or recording systems may be subject to rules on privacy, confidentiality of communications and personal data protection.
Before use, the buyer is responsible for checking that the device is legal in the country and specific context where it will be used. Endoacustica Europe supplies these systems for lawful professional, investigative, corporate and security applications.
Already have an object to modify, or need a specific solution? Send us the project details, any photos of the object and the functions you need. Our lab will assess feasibility and recommend the most suitable technical configuration.
Technical review: Endoacustica Europe Technical Team – GSM Listening Devices and Audio Transmission Systems. Last updated: August 2026.
