Body-Worn Spy Microphone

Description of the article « Body-Worn Spy Microphone »

CorTact Body-Worn GSM Spy Microphone for Discreet Live Audio Monitoring

The CorTact body-worn spy microphone is designed for professionals who need discreet, real-time audio transmission and silent communication support in the field. Worn under a shirt, suit, or uniform, it uses a standard SIM card and the 2G GSM network to send live surrounding audio to a remote caller. At the same time, it can transmit incoming voice instructions to the wearer through an induction earpiece, creating a practical hands-free communication system.

This combination of silent auto-answering, body-worn concealment, and long-distance GSM calling makes the CorTact suitable for legitimate professional applications involving security, monitoring, coordination, and operational communication. Its design focuses on discretion, ease of use, and dependable voice transmission without requiring Wi-Fi, apps, or visible interaction with the device.

Silent GSM Audio Transmission with No Distance Limitation

At the core of the CorTact is its GSM microphone function. After inserting a compatible SIM card, the remote operator simply calls the number assigned to the device. The unit answers automatically and silently, with no lights or sounds, and begins transmitting ambient audio in real time.

The built-in amplified microphone captures conversations and environmental sound within an approximate 5 to 10 metre range. Because communication takes place over the GSM network, monitoring is not limited by short-range wireless protocols. As long as GSM service is available, the operator can listen from virtually any location.

This operating method offers several practical advantages:

• Remote live listening through a normal phone call

• Silent operation without visible or audible alerts

• No app or Wi-Fi setup required

• Global GSM compatibility on supported 2G networks

Whether placed in a chest pocket or worn directly against the body, the CorTact is built to provide clear live audio transmission while remaining discreet during use.

Two-Way Communication Through an Induction Earpiece

What distinguishes the CorTact from a simple GSM listening device is its two-way communication capability. During the same call used for live monitoring, the remote operator can also speak to the wearer. The incoming voice is relayed through the device’s induction loop to a discreet earpiece, allowing the wearer to receive instructions without handling a phone or exposing visible equipment.

This hands-free setup is fully automatic. Once the call is connected, the wearer can continue moving naturally while hearing guidance through the selected earpiece. There is no button pressing required, which helps preserve discretion and keeps operation simple in active environments.

For professional users, this means one compact body-worn unit can support both:

• Live ambient audio transmission to a remote listener

• Silent incoming communication to the wearer

This dual function is especially useful where quiet coordination and low-visibility communication are important.

Choice of Nano or Micro Tactical Earpiece

The CorTact package includes a choice of Nano or Micro tactical earpiece, allowing the user to select the format that best matches the working environment and discretion requirement.

Micro Earpiece

The Micro earpiece measures 7 mm long by 3 mm in diameter. It is powered by a silver-oxide battery, which is included, and is described as particularly suitable for noisy environments. It also includes a 1 mm rigid extraction wire for removal. When worn, it remains highly discreet.

Nano Earpiece

The Nano earpiece measures only 1.5 mm x 1.5 mm and is the smallest option offered with this system. It does not require a battery, as it is powered by induction. It is inserted deeper into the ear canal for maximum discretion and is removed using the included magnetic tool.

Both earpiece options are designed to deliver clear audio while keeping the communication method as discreet as possible. The choice mainly depends on whether the priority is the smallest possible size or a format better suited to louder surroundings.

GSM 2G Operation for Straightforward Deployment

The CorTact operates on the 2G GSM network and supports the following bands: 850 / 900 / 1800 / 1900 MHz. This allows it to work with standard GSM voice calling where compatible 2G service is available. The product is specified as compatible with global GSM networks, although the SIM card is not included.

Using classic GSM voice channels offers a simple and familiar operating model. There is no need to pair devices over Bluetooth, configure internet access, or install software. For users who want a direct call-based solution, this can make setup and day-to-day use more practical.

The product description also highlights several GSM-related benefits:

• No range limit beyond network availability

• No app or Wi-Fi dependency

• Works with any basic mobile phone for calling functions

As with any GSM-based device, actual use depends on local network support and signal availability.

Group Coordination with GSM Conference Calling

For team-based operations, the CorTact also supports group coordination via GSM conference calling. A command post can call multiple devices at the same time, creating a live communication network for several users without requiring each wearer to manually interact with their equipment.

This function is intended to support:

• Real-time coordination between multiple agents

• Centralised communication from a command position

• Hands-free operation for users in the field

Because the system works through standard phone calling, it can integrate into straightforward communication workflows without additional hardware complexity on the user side.

Battery Performance and Charging

The CorTact is equipped with an 800 mAh battery. According to the provided specifications, it offers up to 3.5 hours of continuous communication on a full charge, making it suitable for short to medium-duration tasks such as meetings, briefings, monitoring sessions, or coordinated field activity.

Charging is handled through a standard micro USB connection, and the charging cable is included. The stated charging time is approximately 1 to 2 hours.

Key power details:

• Battery capacity: 800 mAh

• Talk time: approximately 3h30

• Charging time: 1 to 2 hours

• Charging method: micro USB

Discreet Body-Worn Design

Discretion is central to the CorTact’s design. The unit is intended to be worn under clothing and can be concealed beneath a shirt, suit, or uniform. During operation, it remains completely silent and uses no lights or indicators, helping it stay unobtrusive in professional environments where visible electronics may be undesirable.

The automatic answering function also reduces the need for physical interaction. Once set up with a SIM card, the device can receive a call and begin operating without the wearer needing to touch it. This supports a more natural and less noticeable user experience.

Technical Specifications

• Microphone pickup range: 5–10 metres

• Network: GSM 2G

• Supported frequencies: 850 / 900 / 1800 / 1900 MHz

• Auto-answer: yes, silent mode

• Induction loop: yes

• Earpiece options: Nano or Micro

• Nano earpiece size: 1.5 mm x 1.5 mm

• Micro earpiece size: 7 mm x 3 mm

• Main battery: 800 mAh

• Talk time: up to 3.5 hours

• Charging: micro USB

• SIM card: not included

What’s Included

• CorTact GSM body-worn spy microphone

• Nano or Micro earpiece depending on selected version

• Magnetic extractor or battery according to earpiece type

• Micro USB charging cable

• User manual in English

Important Legal Information

The use of surveillance and communication equipment may be regulated depending on your location and intended application. Before using the CorTact, it is essential to verify and comply with all applicable local and national laws. This product should only be used for lawful professional purposes.