Portable Concealed Audio Recorder Inside A Calculator

Calculator Audio 75 Day

Product Code: PBN018 Black Vox Audio Calculator

Black Vox Calculator is a professional grade covert voice activated recorder with a long 75 day standby battery life and over 100 hours of active recording.

8 GB of internal storage that can store up to 288 hours of recordings, and it’s a functional calculator that allow it to be hidden in plain sight. These exceptional endurance features and true portability allow the device to hide in plain sight and be placed anywhere within 10 metres of the target location.

This high tech surveillance equipment is charged through the 2.5mm jack to USB cord that is included by plugging it into your computer or laptop or a USB wall charger. High quality voice recording from up to 26 feet away means you can capture every conversation making it a perfect stand-alone audio recording solution. Ideal for use in office based environments and the small form factor allows the device to be taken anywhere, placed inside a bag the device can perform superbly providing it is within 10 metres of the target.

The device comes in the original calculator packaging and is virtually impossible to notice it is a highly covert audio recorder, the only feature which can be seen on the outside is a tiny needle sized hole which is the on/off port for the audio calculator.

The Black Vox Calculator gives you the option to set the time stamp on the recordings to your local time using a Windows computer. Easily listen to or transfer recordings form the 8 GB of internal storage through USB. This product was only available to law enforcement in Europe but is now available to the public in the US. Made in the United Kingdom


  • 75 Day Standby Battery Life – Rechargeable internal battery means your recorder can be in standby mode for over 2 1/2 months and recording time over 100 hours of active recording.
  • 288 Hours of Digital Voice Recording Capacity with an Internal 8 GB Drive – Recordings are saved as MP3 files on the recorder: plug into a computer to listen to, copy, or delete recordings
  • Voice Activated Audio Recording from up to 26 Feet Away – High quality mic allows for clear conversation recordings from far away
  • USB connectivity for charging and offloading files, works with Windows or Mac – 2.5mm jack to USB for charging or data transfer
  • Functions as a solar powered calculator
  • Tiny Pin hole to turn device on/off – Pin Supplied.
  • Size: 5.75″ (146 mm) x 4.5″ (114 mm) x 1.25″ (32 mm)
  • Power Supply: 550mAh (75 day standby and 100+ hours of recording time)
  • Flash Memory: 8 GB (stores 288 hours of recordings)


System Compatibility: Windows Vista, Windows 7, Windows 8, or Windows 10, Mac

USB Port

Small Phillips head screwdriver

Media player to play *.MP3 files

Frequently Asked Questions

Yes, the device is digital and there are no moving parts or sound alerts that would alert attention in any way.

When the device is switched into record mode a discreet LED illuminates for a couple of seconds, but then goes out and then there is no indication that recording is taking place after switching the device on.

Yes, this new unit now has the ability to reference each recorded file with a time and date so you will know when something has occurred.

Yes, the recorder will still pick up sounds from the environment, although if it is heavily buried out of site, the microphone effectiveness may be reduced, we have tested the device in a variety of situations and can confirm the device can perform in very effective conditions – Under a car seat whilst car is moving proves difficult for many audio recorders but Black Vox performs well in this situation.

Recordings can be played back through computer speakers by plugging into the USB port of a Windows or Mac computer using the supplied connection cable. No special software is needed.

No, the Black Vox Recorder is always set to voice activated recording. There is no straight record option.

The recorder will record a new file each time the microphone picks up enough sound to start the recording process and then ends the file when the sounds, voices, etc. have stopped.

Yes, the standard functionality of the Calculator is retained. There will be no difference to the standard version in this respect

Additional Information