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  • GSM Calculator Listening Device

    Made by Spy Equipment UK – Standard desktop calculator with inbuilt long term battery-powered GSM bug that is perfect for many applications. Ideal as a carry anywhere listening device, for inside the house, office, workshop or other indoor application. Very discreet and with excellent audio performance.

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    • Product Code C4LG
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    All parcels are discretely packaged and addressed with no mention of Spy Equipment UK or Spy branding. All parcels must be signed for and can't be left at a property without a signature.

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    £6 - UK Standard (Up To 3 Working Days)
    £6.50 - UK Special Delivery (Next Working Day - before 13.00 hours)
    £18 - UK Express (Next Working Day - before 09.00 hours)
    £12 - UK Saturday Delivery (before 13:00 hours)
    £21 - UK Saturday Express (before 09.00 hours)
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    Worldwide Zone 1
    £25 - Worldwide Zone 1 ( 2 - 3 working days )
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    Worldwide Zone 2
    £31 - Worldwide Zone 2 ( 3 - 4 working days )
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    USA & Canada
    £18 - USA & Canada ( 1 - 2 working days )
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    From £195.00 Excl. VAT


    The GSM Calculator Listening Device is a discreet audio bug, built into a working calculator, that can provide the ability to listen ‘live’ to what is happening in the environment where it has been placed without the need to have a permanent mains power supply.

    Excellent Microphone – Auto-answering Listening Device

    As with all GSM Bugs, the GSM Calculator Listening Bug requires a mobile phone SIM card inserted within so that it can be contacted from anywhere in the world, if required. When the number of the inserted SIM is called, the listening device will – without alerting attention in any way – auto-answer the call and open up its in-built sensitive microphone. The microphone will enable the caller to listen into the surroundings within a radius of up to ten metres. This amazing GSM listening bug unit delivers really clear audio quality and because it is enclosed inside a working desktop calculator, it can be left in plain sight or even used in a meeting situation if desired without arousing suspicion.

    A Listening Bug With A Decent Battery Performance

    The major limiting factor with most small stand-alone spy devices is the battery life. The GSM Calculator listening device is certainly quite compact, but still manages to function as a GSM audio bug for a perfectly acceptable period of time given the size of the product. The internal lithium ion rechargeable battery pack will give a combination of up to 9 days standby time and up to 9 hours of listening-in time (optimum conditions), meaning that you will get a combination of the two figures dependant on how often you call in and for how long.

    Programmable Sensitivity and Sound Activation – Live GSM Listening Device

    Like most of our listening devices, this GSM listening device has quad-band capability which means that it can be used in every country worldwide. In addition, the product also features a voice activation facility, with sensitivity setting (sends SMS notification when sound is detected in vicinity of device), adjustable microphone sensitivity to suit the environment the unit is placed within. These can be programmed remotely or adjusted using a coded text message. Full instructions are supplied to enable easy use of these extra features.

    A Listening Bug Made for Variety of Situations

    The unit is best deployed in a position where it can pick up sounds in the environment where it has been placed. At home it could be left in plain sight maybe on a desk, or out of view on top of a cupboard is required. The sound activation is best used in a normally quiet environment or just as an alert for an event such as someone entering a room. It should be noted that using the voice activation facility will require credit on the inserted SIM (or a contract SIM being used).

    Rechargeable Internal Battery

    The internal lithium battery in this GSM listening device can be recharged using the supplied magnetic USB lead for subsequent stand-alone deployment . Charge time is up to four hours and cab be done by connecting to a computer USB port or for best results by using the Mains USB plug which normally results in a faster charge time. Contact us if you would like to know more about this listening device and to discuss the right product for you.


    • Battery powered GSM listening device built into an everyday working desktop calculator
    • Call this listening device from any mobile phone or landline – unit will auto-answer
    • outstandingly crisp audio quality – microphone has adjustable sensitivity that can even be controlled remotely (by coded SMS message)
    • Totally discreet operation – this GSM listening device auto answers without any alerts (lights or noise)
    • Discreet pin operated on/off switch – Requires opening to recharge internal battery/li>
    • Simple to use ‘plug and go’ technology – No specialist technical knowledge required
    • Internal Lithium Ion rechargeable battery (550mAh) – charge from computer USB or mains power adapter
    • Up to 9 days standby time – Up to 9 hours listening-in time (battery life maximises after 3 to 4 full charge/discharges)
    • Quad-band operation – accepts any GSM network SIM (850, 900, 1800 or 1900MHz) covering all countries worldwide
    • This listening bug is designed to work with any activated micro SIM card – Vodafone SIM with credit available on drop-down menu
    • Calculator unit dimensions: 145 mm x 103 mm x 28 mm high (from desktop surface to highest point)
    • Includes magnetic USB charging lead and USB to mains power adapter and a full set of instructions
    • Perfect standalone listening bug suited for deployment in the home in the office or any other room environment

    Would the GSM Calculator Listening Device still pick up sounds if it was on top of a cupboard or underneath a low settee?

    As long as the device is in the airspace of the environment where conversation is taking place and the microphone holes are not covered, then it will pick up on these voices (within the sensitivity range)

    If the battery expires during use, will the bugging device make any sounds to indicate that the battery is about to go?

    The unit is totally covert. The unit will give no visual or audible indication of the battery’s expiration.

    Will this GSM listening device work outside the UK?

    This listening unit has a quad-band modem and therefore will work anywhere around the world on the GSM networks 850, 900, 1800 and 1900MHz bands.

    Will this unit take any GSM SIM card?

    These units have been designed to accept a micro size SIM cards from any network, although of course it has been impossible to test every network SIM provider around the world and these are designed for the 2G network so in the UK 3 Network SIM’s cannot be used. Also in USA the 3G network is no longer active.

    If I left this on a desk, would it be obvious what it was?

    The device is not a giveaway, although a detailed examination by somebody with knowledge of surveillance devices may arouse some suspicion because of small holes in the sides for microphone and pin on/off switch. To the untrained eye the GSM Calculator should not alert attention.

    Can I call the unit from any phone (mobile or landline phone)?

    Yes, the unit will accept calls from both types, but to make use of the voice activation facility only a mobile phone can be used.

    Consider the Following When Using this Listening Bug:

    • You will need a working mobile phone to enable you to listen in to the bug and control its features.
    • To be able to take advantage of the voice activation facility and SMS alerts, the SIM card inside the GSM Black Box will require credit or will need to be a contract SIM. The unit can be supplied with a Vodafone SIM with £10.00 credit as a cost option.
    • The calculator listening bug is powered separately from the GSM unit which means the calculator function will still work even if the listening device battery needs charge.
    • Just like any mobile phone, the GSM Enduro can lose network signal from time to time, especially when deployed inside a moving vehicle that is travelling through varying signal strength areas.
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