The Mares Tank Module transmits tank information to the Mares Icon HD or Mares Quad Air computer. This transmitter has a color LED for a quick tank check at the surface or to alert a dive buddy of a low air situation during a dive. 

The LED Tank Module allows you to transmit tank pressure directly to your Mares dive computer. Through a color code, it is possible to see an immediate estimate of the level of gas present in a cylinder.
Once mounted on your first stage, on one of the high-pressure outlets (7/16") it can be associated with your computer in no time.
Through a color-coded LED, it can be used as a pressure gauge, even when on the surface. The probe has a flashing LED that indicates gas pressure using three colors: green for over 180 bar, yellow at 100 bar, and red below 50 bar.
Through the use of the LED Tank Module, the dive computer is able to provide you with the real consumption in liters once the cylinder volumes have been set, thus optimizing bottom time according to decompression gas supply.
To prevent excessive battery consumption through flashing, if there is no change of more than 1 bar for more than 4 minutes, the flashing is deactivated.
The battery is a CR123A and allows between 150 and 200 dives, taking into account operating temperatures.