LongLife PRO 20 K+


LongLife series 20PRO K+ is an upgraded version of LongLife series, due to a surge in demand for even better sound quality we have decied to use a Knowles Microphone on the device which gives it competitive edge at an affordable price. 

More details

20 Days stand-by
Knowles Microphone

GSM Spy Bug LONGLIFE 20PRO K+ can last for up to 20 days in stand-by mode. It is a very reliable listening device with easy installation and very good quality in standby and call-back performance. The design is similar to the rest of our other LongLife units, focusing on a minimalist look so the device can be very easily disguised. 


The sound quality is very similar to the Glite series where we are using a similar microphone but a more advanced chip structure, this unit stays very basic in terms of commands. Voiceback activation is the only command. 


  • extremely clear sound
  • up to 20 days stand-by
  • 4 - 6 hours of continuous listening
  • VOX call back function

Package contents:

  • charging adaptor
  • charging cable
  • 3M mounting system
Number of microphones1
Max. distance from the microphone10 and more meters
Possibility of non-stop operation when connected to electricityyes
Dimensions45 x 35 x 30mm
Battery life in stand by16 - 20 days
Battery life in automatic activation mode2 - 4 days
Battery life in continuous call8 - 12 hours
Operators supportall
Voice activationyes
Vibration sensor activationno
Call number filterno
GSM frequency ranges850/900/1800/1900
Working voltage3.4—4.2V  DC
Standby current≈2.5mA
Start sound-controlling current≈30mA
Speaking current≈150mA
Working ambient temperature-20℃~+70℃
Working ambient humidity20%~80% RH
microphone attributes:
TypeElectret Condenser
Frequence range100Hz ~ 10kHz
Sensitivity-53dB ±3dB @ 74dB SPL
S/N ratioX
Size2.57mm Dia

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