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Covert listening and recording
Professional Audio Surveillance Equipment
Audio surveillance equipment captures conversations for live listening or recording. Endoacustica’s range includes hidden listening devices, miniature voice recorders, directional and contact microphones, and receivers for compatible audio transmitters.
Listening devices send audio to a phone, app or receiver; recorders save it for playback. Directional microphones collect sound from the operator’s position, while contact microphones pick up vibrations through a surface. Explore each category for the available models, specifications and connections.
Listening, Recording & Audio Reception
Listening Devices
Listen to conversations remotely with compact Wi-Fi, cellular or radio transmitters. Choose phone or app access, a dedicated receiver, or an encrypted system for protected audio transmission.
Hidden Voice Recorders
Record conversations for later playback with miniature, pocket-sized or disguised recorders. The range includes continuous, voice-activated and scheduled recording, with remote file retrieval on selected models.
Directional & Parabolic Microphones
Pick up sound from the operator’s position with directional and parabolic microphones. The category also includes optical systems that recover audio from surface vibrations, using a different method from conventional microphones.
Contact & Wall Microphones
Contact microphones pick up vibrations through a surface rather than collecting sound directly from the air. Explore probe and amplifier systems for listening through suitable walls and other structures.
Radio Receivers & Transceivers
Receive audio from compatible transmitters or use two-way radios for team communication. Compare supported bands, modulation and digital formats when selecting a receiver for an existing system.
Landline Listening Devices
Capture conversations carried over a telephone line using a dedicated line interface and receiving system. These devices monitor call audio, rather than sound in the surrounding room.
Phone Monitoring & Cellular Systems
Spy Phones & Phone Monitoring
Explore phone monitoring software, configured smartphones and hardware-modified phones. Each approach has its own device compatibility and audio capabilities; the category pages explain the available configurations.
Law enforcement & government
Lawful Interception & Cellular Systems
Specialist cellular equipment for law enforcement and government agencies. This category covers subscriber identification, cellular monitoring and mobile forensic tools, with capabilities specified for each system.
Discreet Communication & Voice Modification
Earpieces deliver spoken instructions to the wearer. Voice changers alter the caller’s voice. These categories complement the listening and recording equipment above.
Covert Earpieces
Receive spoken instructions discreetly through a miniature earpiece. Compare phone, radio and induction-based connections for presentations, coordinated activities and professional communication.
Telephone Voice Changers
Adjust voice pitch and tone during a call. Compare hardware voice changers for corded landline phones, mobile phones and computers, with connections and controls suited to each setup.
Audio Surveillance Guides
Listening from a Distance
Receiving audio from a remote microphone and picking up a distant conversation require different equipment. Our long-range audio surveillance guide explains the distinction and compares the available approaches.
Radio Transmitters and Receivers
For a direct radio link, the receiver must support the transmitter’s frequency and modulation. Read the radio audio bug guide for receiver compatibility, power options and factors that affect range.
Frequently Asked Questions
What equipment is used for audio surveillance?
The main categories are listening devices, voice recorders, directional and contact microphones, and audio receivers. Listening devices transmit sound to another location; recorders store it. Microphones and receivers serve different roles within a complete system.
Can I listen live and save a recording?
Yes. Some devices combine live listening with recording, while other setups use a recorder connected to the receiver. The product page specifies whether audio is saved locally, on a memory card or through the receiving software.
Which equipment lets me listen from my phone?
GSM listening devices can provide access through a phone call, while supported Wi-Fi and cellular systems use an app or software platform. Radio transmitters use compatible receivers. The listening device category lets you compare these connections.
Can Endoacustica help me select and set up the equipment?
Yes. Endoacustica provides product consultation, technical support and training. Tell us what you need to capture, how you want to receive the audio and whether you need recordings. We can help identify suitable equipment, receivers and power options.
Equipment Selection & Technical Support
Need live listening, stored recordings or both? Tell us where the audio will be captured and how you want to access it. Our team can help you select the device and any receiver, power supply or connection it requires.