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STronic GSM Spy Bug LONGLIFE 20 PRO K Plus with 20 Days Standby
239,00  EUR  ex VAT
298,75  EUR  inc VAT
Delivery in 15 days
14 day refund
24 month warranty

LONGLIFE 20 PRO K+ is the newest addition in the LongLife GSM Spy Bugs series, equipped with an extended Knowles Microphone, providing crystal clear sound for up to 10 meters distance. 

When connected to electricity, this GSM Spy Bug offers unlimited listening time. Alternatively, when left somewhere without a power supply, you can continuously listen in for 8-12 hours. In standby mode, it lasts 16 - 20 days, and thanks to the Voice Activation call-back function, you can listen in only when sounds are present, such as talking in the bug's surroundings.

The LONGLIFE 20 PRO K+ features an extended Knowles microphone that ensures clear audio within a 10+ meter radius, ensuring you don't miss anything important happening around the device. 

Its minimalist design allows for easy installation and reliable use, and the 3M mounting system further simplifies the process. Plus, it can easily blend into any setting due to its discreet appearance.

Setting up requires only a SIM Card. After inserting the SIM Card, you call the device. Following the setup, you can call the device anytime and listen to everything near its vicinity, and the voice activation can be remotely powered on/off via SMS commands.

Compared to the LONGLIFE 60, the LONGLIFE 20 PRO K+ provides superior audio quality and increased range, despite its shorter battery life.
Other options within the series include the LONGLIFE 20 and LONGLIFE 20+ which offer the same listening times as the LONGLIFE 20 PRO K+ but with lower audio quality and a shorter range.
On the other hand, the Micro Spy Bug and LONGLIFE 10 are more compact and lightweight but come with shorter standby and listening times.

For more information about choosing the perfect fit for you, take a look at the comparison table below:

Find all StealthTronic products at this link.

LONGLIFE 20 PRO K+ Main Features:

  • Extended Knowles microphone for clear audio within a 10+ meter radius
  • Up to 20 days in standby mode
  • Voice Activation call-back function
  • 8-12 hours of continuous listening

LONGLIFE 20 PRO K+ Full Specifications:

Range: Unlimited
Number of microphones: 1
Max. distance from the microphone: 10+ meters
Possibility of non-stop operation when connected to electricity: Yes
Weight: 60g
Dimensions: 5,2 x 3,0 x 1,7 cm
Battery life in stand-by: 16 - 20 days
Battery life in automatic activation mode: 2 - 4 days
Battery life in continuous call: 8 - 12 hours
Operators support: All
Voice activation: Yes
Vibration sensor activation: No
Call number filter: No
GSM frequency ranges: 850/900/1800/1900
GPRS: Upload60,TCP/IP
Working voltage: 3.4—4.2V DC
Standby current: ≈2.5mA
Start sound-controlling current: ≈30mA
Speaking current: ≈150mA
Working ambient temperature: -20℃ ~ +70℃
Working ambient humidity: 20% ~ 80% RH

Microphone attributes:
Type: Electret Condenser
Direction: Omnidirectional
Frequence range: 100Hz ~ 10kHz
Sensitivity: -53dB ±3dB @ 74dB SPL
S/N ratio: X
Size: 2.57mm Dia

Package Contents:

  • Charging adaptor
  • Charging cable
  • 3M mounting system

How to use the GSM Spy Bug LONGLIFE 20 PRO K+:

  1. Plug the device into a power socket and wait for it to be charged - 4 h.
  2. Unplug the LONGLIFE 20 PRO K+ from the electricity and wait for 10 sec for the device to boot up.
  3. You are now able to call the device. It will pick up the sound from a 5 - 10 meters range. 
  4. Call-back activation: The callback function is activated via SMS by sending 1111.
  5. Call-back deactivation: by sending SMS; 0000.
* To change the number, remove the SIM card from the device, insert a new SIM card with the number you wish to use, and call the number right away. 


It was not developed for continuous usage of 220 V.

The quality of the mobile signal in the place of installation strongly affects the quality of interception.

SIM Card not included.

Please format the battery before first use as instructed in the PDF below. 
For more info regarding GSM Bug please carefully study the PDF file below. 

Starting from 2020 the 2G network is no longer accessible in the USA, and these devices work on 2G. If you are from the US, you can use the 3G unit.

24 Months Warranty

>>User Manual<<
>>Download detailed specifications (PDF)<<


Disclaimer: Items on the website are not be used for the purpose of illegal surveillance of unsuspecting subjects. The items are to be used only in compliance with all the local laws and regulations under the threat of penalty.

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