Spy bug with extremely long operation time - 5KL
Spy bug with extremely long operation time - 5KL

  • Customer rating:
    Average: 5 / 5 Based on 5 reviews
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Spy bug with extremely long operation time - 5KL

  • Operation time up to 37 days
  • High sensitivity microphone
  • Conversation audible from 10-12m
  • Precise amplifier
  • Spy bug operates in effective range up to 1km
  • WFM modulation

Availability: AvailableInStock


£132.00tax inc.

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  • Please Note!
  • In order to use this bug you will need a receiver (listening device) to get the signal from the bug. The bug itself needs a receiver in order to to listen what is happening in the bug environment. If you don't have any, please contact us contact@detective-store.com and we will find a receiver for you

A highly sensitive bug 5KL - operation time up to 37 days!

The quartz bug is professional equipment which will ideally prove itself as an instrument in detective work and to effectively conduct eavesdropping at home or workplace.

  • Work time

    Work time

    up to 37 days

  • Range the microphone

    Range the microphone

    up to 12 m

  • Activation call

    Transmission range

    1 - 2 km

  • Power supply

    Power supply

    battery LR20

The specialised quartz bug 5KL is a design adjusted to the professional and very discreet invigilation. 5KL is equipped with very sensitive microphone and professional amplifier, which ensure that the gathered sounds from the distance of up to 10 - 12 meters are clear, without unnecessary noises and at the same time harmonised. A feature distinguishing 5KL among other models is its extremely long operation time – up to 37 days! There is no need to replace batteries frequently which is useful when we do not have easy access to the place where the bug is installed.

Strengths of 5KL bug

  • Very long operation time


    It eliminates almost entirely the possibility to detect the bug, because it is not necessary to continuously recharge or replace batteries which may arouse suspicion on the part of the third parties.

  • Very sensitive microphonE


    The microphone supported by a high quality amplifier picks up sounds within the range of 10-12 meters providing clear sound. The possibility to adjust sensitivity to ambient conditions.

  • Safe frequency


    The bug operates within the frequency range of 430-440 MHz which makes it impossible to detect by the third parties due to other frequency of standard receivers. Operation at a specified bandwidth is stabilised by a quartz resonator.

  • Transmitter range


    Transmission range in the open space is from 1 to 2 km. However, it must be remembered that this value is reduced to 200-300 meters in densely built areas.

  • Maximally discreet


    Convenient to use thanks to its small size and extremely long operation on a single battery. Easy to camouflage, e.g. behind a cabinet, bed, between books, etc.

  • Extremely easy to use


    You don't need to have specialised knowledge. Devices receiving transmission from the bug can be found in "Accessories" tab.


The battery is not included in the set. For the 5KL sensitive bug we recommend SAFT battery LS33600 3,6V.


AlfaTronik is the undisputed leader on the Polish market in the production of detective devices for audio transmission and audio-video recording . The AlfaTronik company is the oldest and most experienced company in the detective industry . It has more than 20 years of...


Specification of Spy bug with extremely long operation time - 5KL
Operation time37 days
Signal amplifieryes
Microphone range of the spy bug10 - 12 m
Operation frequency430 - 440 MHz
Transmitter range of the 5KL1000 - 2000 m
Stability0.0001 MHz
Power supply of the spy bugLR20 3.2 – 4.6 V battery
  • diameter: 20 mm
  • antenna: 165 mm


  • Transmitter
  • User manual of the Spy bug with extremely long operation time - 5KL

The set does not include battery, we recommend SAFT LS33600 3.6V.


Reviews (5)

By Jasper H.

The customer has rated the product but has not posted a review, or the review is pending moderation

By Ezra M.

Comment : No reservations concerning the quality but I was uunpleasantly surprised that the battery is not included in the set
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By Aidan D.

Comment : A powerful professional listening bug that can work for more than a month and has range of up to two kilometres/ Solid spy gear
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By Paige T.

Comment : The microphone is sensitive plus has a strong amplifier what result in high qality sound even from ten meters
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By Phoebe T.

Comment : excellent store service and fast delivery.. I am one happy customer!
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