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GSM bugs - Endoacustica
https://www.endoacustica.com/remote-listening-devices-gsm-bugs.php
GSM bug is activated when an object or vehicle it is put on travels through a motion sensor. When the voice activation system detects sounds or noises in the environment where the GSM bug has been secretly installed, it turns on the GSM bug's microphone. Bugs may be simply attached to landline phones using the same GSM technology.
GSM listening devices - spy equipment and surveillance …
https://www.detective-store.com/gsm-listening-devices-122
The main advantage of the GSM audio bug GF-07 is its small size of 90x60x6 millimetres. It is therefore very easy to conceal. You need to insert an active SIM card in the device for the eavesdropper to be ready for operation. The built-in sensitive microphone picks up sounds at a distance of 5-6 metres and transmits them using a phone call.
Mini Remote Listener Activated Voice Call Back Bug ...
https://www.amazon.com/Listener-Activated-Bug-Surveillance-Listening/dp/B07GT31NSW
Specifications: Power Supply:24 hours Non-stop Card Compatible:GSM / SIM Microphone Range (Meter):5~7(Radius) Receive Sensitivity:-+10K Working Temp:-40~50'C Responding Frequency:1.2K~800Khz Stand-by Time:Support voice control with 3-5 days,10-15 days without voice control Working Time:5 hours Approved: CE / FCC All GSM SIM card compatible Work …
Spy Listening Devices for Remote Use | Endoacustica.com
https://www.endoacustica.com/spy-listening-devices.php
A bugging device is pretty straightforward. All you have to do is insert an activated GSM SIM card in the device and place it discreetly in the room where you want to listen in on conversations. The spy listening device will automatically place a call on your phone when people are talking nearby and you will have full access to the conversation.
Spy Gadgets | Voice Recorder | Spy Camera | Spy Gear
https://comsecllc.com/spy-gadgets/
GSM Cellular Bugs GSM cellular bugs use a SIM card to remotely monitor audio. GSM bugs work over a cellular network, such as 3G or 4G. They are often called wireless listening devices. GSM bugs can be ‘dialed into’ remotely to access the recordings.
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