The Brother BT5000Y Yellow Ink Refil for T300 is a replacement ink bottle for certain Brother printers. This refill can be used for the DCP-T300, T500W, and T700W, and it contains 50 mL of ink per bottle. It is not an OEM product, so you cannot expect that it will work with your machine. The brand names are used only to demonstrate compatibility with the named printers.
The INKvestment Tank, a predecessor to the Brother INKvestment Series, is an ink-saving technology that takes user behavior into account. Consumers have long been complaining about the expense of ink, but this product eliminates that hassle completely. It addresses all the pain points consumers have with ink, and it does so on a whole new level.