What is this silver and transparent green electronic piece for / from I found this Lego in a box with other old Lego parts and I have no idea what it is for. It has a 'Lego' logo with a code 5202 but I can not find anything online.

Could someone please give me more info on this?
This is a Spybotics Module from set 3809-1 Technojaw T55.