This is a 5g syringe of white heatsink compound to use you're connecting a component to a heatsink, it'll really helps to dissipate the potential heat from damaging the components like transistors.
This complete module is built upon the same technology as the ET-301, but includes on-board voltage regulation, LED status indicator, battery backed RAM, and a built-in patch antenna! 6-pin interface cable included. This EM-506 GPS module is powered by SiRF Star IV, it can provide you with superior sensitivity and performance even in urban canyon and dense foliage environment.