blue background
Get in Touch Oyster2

Cat-M1/NB1, Compact Long-Life Battery-Powered GPS Asset Tracking


The Oyster2 is the evolution of the hugely popular Oyster Cellular.

Digital Matter's compact, rugged battery GPS tracking device has been designed for tracking containers, trailers, skip bins, and other assets where super-long battery life is required without sacrificing the frequency of updates and performance.


  • 4G LTE Cat-M1/Nb-IoT Modem (2G option)
  • High performance GPS and accelerometer tracking
  • Powered by 3 x AA Lithium Iron Disulphide or LTC batteries
  • Battery Meter for accurate monitoring
  • Up to 7 years once daily updates
  • Up to 1 year once hourly updates
  • IP67 rugged weather-proof housing
  • Small, compact and easy to install and conceal

Read on below to see the key features that make the Oyster2 such a powerful tracking device!

4G Cat-M1/Nb-IoT Modem

The Oyster2's 4G modem is compatible with both Cat-M1 and Nb-IoT networks - enabling great new benefits. Traditional cellular network specifications (like 4G LTE Cat 9/12) are designed to provide high speeds and bandwith - to enable smartphone users to stream videos and facilitate other data-intensive activities.

IoT devices don't need this type of bandwidth and are typically trying to solve other problems. These IoT devices require
  • Small data messages typically at low data rates
  • Long Range
  • Low power to allow for long battery life
  • Low cost - to facilitate the deployment of many millions of them
The LTE Cat-M1 and NB1 specifications allow the cellular modem (uBlox SARA R4) to be simpler and smaller. In our testing we have measured that our new Cat-M1 devices use anywhere from 1/2 to 1/3 of the power of our 3G devices to perform a data upload.

Battery Meter

The Oyster2 is fitted with a Coulomb Counter which tracks the devices energy consumption. It is hard to predict the battery life of LTC batteries due to their flat discharge curve, the Battery Meter enables an accurate battery level to be determined for great features such as:
  • Accurate Low Battery Alerts - Alerts can be set at any level which provides enough time for new batteries to be fitted.
  • Battery Life Predictions - The Oyster2 can simply be deployed in the application with the desired settings for a short time (a week or so). The energy usage over this time can be determined, and from there battery life can predicted accurately - no more guesswork!


The Oyster2 uses bank-level AES-256 device authentication and data encryption to ensure that your data is kept private and secure.

LTC Batteries

The Oyster2 can be powered by Lithium Thionyl Chloride (LTC) batteries. These batteries help achieve the optimum performance due to the following reasons:
  • Higher quality out of the box, meaning less chance of early failures compared to other battery types
  • Extended temperature tolerance, operating temperatures of -40°C to +85°C are typical
  • High Capacity - meaning many years of operation
  • Extremely low self discharge - typically around 1%

3D Accelerometer

The Oyster2 is fitted with a 3-axis accelerometer which allows the device to ‘sleep’ in an ultra-low power state yet still wakeup when movement occurs. The GPS and accelerometer are used in tandem to intelligently determine when the device is moving, and increase the frequency of location updates. When movement ends, the update rate is scaled back to once per day. This ensures that up to date location information is always provided, without wasting any data or battery life.

The frequency of updates is easily configurable Over-the-Air, so that the desired update rate or battery life can be achieved.