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Professional Digital Audio Transmitter with Remote Control STRC-405


STRC-405 The Digital Surveillance Transmitter series consist of specialized surveillance devices, remote controlled surveillance recorder features, encrypted surveillance transmitters, and data monitoring equipment, all able to send wireless voice and data as a digital stream. Surveillance Transmitters, designed for broadcasting audio surveillance, enable users to conduct information gathering of communications intelligence or COMINT.

This digital spy bug will transmit a digital radio signal, providing for absolute clarity of sound. Our digital bugging devices use an advanced technology that optimized the transmission quality and most of all, thanks to its encryption method, makes the transmission absolutely impossible to decipher for whoever tries to intercept the digital transmitter signal.

Only who uses a receiver with the proper decryption key (STV-05) can listen and record to the transmission. Quality digital bugs use spectrum inversion, that is, they cut the signal in millions of little pieces which are then transmitted in so called "bursts".

Due to its tiny size the digital spy bug can be concealed in various items. The STRC-405 transmitter is suitable for the most miniature types of camouflage, making it an indispensable intelligence gathering tool for nearly every scenario.

The low power consumption enables excellent long-term audio monitoring operations. The STRC-405 provides excellent transmission quality, making them the ideal choice for body-worn applications, close protection monitoring and temporary deployments.

The digital bugging device is a digitally encrypted transmitter capable of broadcasting the conversation of a target to a matched Radio Receiver (STV-05) upon command by a wireless remote control. The radio receiver decodes the room transmitter or covert listening device transmissions so the user can privately monitor the surveillance conversation. Anyone that accidently intercepts the RF transmitter using a radio scanner or surveillance receiver would not be privy to the communication as this listening device is designed to transmit encrypted signals from the room transmitter only to a Radio Receiver (STV-05) that is able to decrypt those signals.

By remote control, the user activates the encrypted spy bug of the listening device. This encrypted transmission in the form of a digital audio signal is then sent from the RF transmitter as a data stream to a matched receiver.

The listening device has no RF emissions while it is in its 'sleep mode' and cannot be detected by most types of counter surveillance equipment.


  • Design for Hidden Installation
  • Intelligence collection from criminal or terrorism
  • Close protection monitoring
  • Standard Indoor Surveillance Operation
  • Homeland Security
  • Temporary deployments
  • Law enforcement, Governmental or Police agency


  • 200 frequency channels
  • Programmable 5-digit PIN to encode transmission and prevent from non-authorized listening
  • Programmable 5-digit PIN to enable remote control
  • Audio input for external microphone
  • Battery low warning
  • Built-in Frequency Synthesizer
  • Built-in charging chip
  • Small size
  • Long time in Standby mode
  • Designed for working with STV-05 Digital and Analog Receiver
    Can do the following settings by remote control:
  • Activate/Deactivate the transmitter
  • Change frequency of transmitter
  • Change output power of the transmitter


Frequency of the transmitter (setting with remote control):   875 MHz ÷ 915 MHz
Step of transmitter frequency setting by remote control   200 kHz
Output Power in Low/ High Mode (setting with remote control):   +10 dBm/ +20 dBm
Modulation:   QPSK
Audio coding   nonlinear PCM
Power Supply:   3.6V (Li-pol battery 230 mA/h)
Operation time in standby mode:   > 2 Months
Operation time in Low Power mode:   6 hours
Operation time in High Power mode:   2 hours
Antenna:   70 mm
Microphone:   built-in, Knowles (optional - extension)
Dimensions:   48 x 23 x 12 mm
Charger:   5VDC, 500mA
Charging time:   < 90 min

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