Order until 14:00 CET and we will ship today! One-day delivery across EU
BTech 4K IP functional Calculator DVR
199,00  EUR  ex VAT
248,75  EUR  inc VAT
Ready for delivery
14 day refund
24 month warranty

The BTech 4K IP Calculator camera with IR recording and 10 h battery for complete indoor surveillance.

It is an everyday object we are all used to and do not pay much attention to when seeing it laying around in the home and office spaces. This calculator looks and works just like the usual one we see in supermarkets and office supply stores. 
Hidden inside is an A/V DVR that offers 4K and 1080P recording options. It is an IP device, which means that you can connect it to your router and access the feed from anywhere in the world with an internet connection on your smartphone. 
The App offers many functions for controlling and calibrating your device. 
Multiple people can access the device via Wi-Fi at the same time. However, when you connect your device to IP, the only way for another person to access the feed is if you share the invitation via QR code (in App) or email account (also in App). The person you share it with can then access all the functions in the App as you, and access the live feed as well. 
The App also allows you to share the logs with colleagues, friends, or family. It can be easily shared via social media in just a couple of clicks. However, it can only be shared when the device is connected via IP. When accessing the device on the same network without an IP connection, the files will not reach you. 
In-App you can rotate the camera, you can choose two ways to turn off the LED lights of the DVR that are already very well hidden. That way you can make sure that no one will accidentally stumble upon the fact that the device is a covert IP camera.
Scheduled recording is available, and motion detection as well as continuous recording mode. The battery status of the device can also be seen in the upper corner of your live feed. 
The user manual is provided with the device, and it is available in the App. 

Calculator DVR Main Features: 

  • Wi-Fi and IP enabled DVR (A/V)
  • Functional Calculator!
  • 4K resolution 3840*2160 and 1080P option
  • 10 h battery lifetime
  • InfraRed recording for low light or at night (switches automatically)
  • Scheduled recording option
  • Motion detection and continuous recording mode
  • Send/share logs with colleagues or family
  • Share IP connection via QR code or email with colleagues or family
  • Snapshots available
  • Download and share the video and photo materials
  • Supports up to 128 GB SD cards


You can download the App here. Or go directly to Google Play Store or App Store. 
The App can also be downloaded via the QR code available on the user manual, that arrives with the device. 

Calculator DVR Full Specifications:

Pixel: 1200 Mega CMOS
Resolution: 1080P/720P
Video Format: avi
Angle of View: 90 degrees Celsius
Recording mode: Motion Detection and continuous
Minimal Illumination: 1LUX
Battery Capacity: 1500 mAh
Video Duration: 10 h
Compressed Format H.264
Recording Range: 5㎡
Consumption: 240MA/3.7V
Storage Temperature: -20-80 degrees
Operating Temperature: -10-60 degrees Celsius
Operation Humidity: 15-85%RH
Memory Card Type: TF card (not included)
Maximum capacity of memory card: 128GB. 32 GB SD card provided with the product
Player Software: VLCPlayer/SMPlayer
Computer Operating System: Windows/Mac OSX
Mobile Phone Operating System: Android/iOS
Web browser IE7 and above, Chrome, Firefox, Safari. etc

How to use the Calculator DVR:

  1. Insert an SD card into the DVR
  2. Power on the device and wait for cca. 20-30 sec. The switch is below the battery insertion space, near the SD card insertion slot
  3. Go to your Wi-Fi settings and find the device
  4. Select the device and proceed to open the App
  5. You will be able to connect (in the same Wi-Fi network) right away
  6. The app will guide you toward the IP connection process, which is set up in a couple of intuitive steps

BTech 4K IP functional Calculator DVR FAQs

Can I view the live feed from the BTech 4K IP Calculator DVR remotely?
Yes, you can view the live feed remotely by connecting the device to your router and accessing it through the app on your smartphone. This feature enables real-time surveillance from anywhere in the world with an internet connection.

Can multiple people access the BTech 4K IP Calculator DVR at the same time?

Yes, multiple users can access the device simultaneously over Wi-Fi. However, remote access via IP requires sharing an invitation through a QR code or email via the app, allowing others to view the live feed and use app functions.

How do I share access to the BTech 4K IP Calculator DVR with others?
Access can be shared by sending an invitation through a QR code or email from the app. This allows the invited person to access the live feed and all app functions, ensuring controlled access to the device’s surveillance capabilities.

How do I turn off the LED lights on the BTech 4K IP Calculator DVR?
The LED lights can be turned off in two ways through the app, ensuring the device remains discreet during operation. This feature helps to maintain the covert nature of the surveillance device, preventing it from being detected.

How does the BTech 4K IP Calculator DVR work?
The device works by recording audio and video, which can be accessed remotely over an IP connection through a dedicated app. After inserting an SD card and powering on, the device connects to Wi-Fi, and the app guides through the IP connection setup. It offers features like motion detection, scheduled recording, and IR recording for low light conditions.

How long is the battery life of the BTech 4K IP Calculator DVR?
The device has a battery life of up to 10 hours. This allows for extended surveillance without the need for frequent recharging, making it suitable for long-term monitoring in various settings.

What is the BTech 4K IP Calculator DVR?
The BTech 4K IP Calculator DVR is a covert surveillance device disguised as a calculator with 4K and 1080P recording options. It functions as a regular calculator while housing an A/V DVR for indoor surveillance. The device is IP enabled, allowing remote access from anywhere via an internet connection.

What is the maximum SD card capacity supported by the BTech 4K IP Calculator DVR?
The device supports SD cards up to 128 GB. This allows for extensive recording storage, accommodating long hours of video without the need for frequent data transfer or card replacement.

What recording options does the BTech 4K IP Calculator DVR offer?

It offers 4K and 1080P recording options, along with motion detection, scheduled recording, and continuous recording modes. The device automatically switches to IR recording in low light or night conditions, ensuring clear video quality at all times.


The user manual will be provided with the device. For any questions, feel free to contact us. 

24 Months Warranty
>>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.

This website uses cookies for better user experience and functionality. Learn more