# EEG Models --- We have two models of Biosemi A/D-boxes. Two are the newest ActiveThree's and the remaining five are ActiveTwo's/Active2.5's. ##### **ActiveThree** Two rooms of B-447 (A & B), make use of the newest [BioSemi ActiveThree](https://www.biosemi.com/activethree_full_specs.htm) systems. These work primarily the same as the older system, but have slight differences in procedure. On the desks for these rooms, [instructions](https://bblabs.fgb.vu.nl/attachments/16) are placed; please make sure to read these! You can also find these in the "*Attachments*" section next to this chapter. ##### **ActiveTwo/Active2.5** The remainder of the rooms make use of the [BioSemi ActiveTwo/Active2.5](https://www.biosemi.com/activetwo_full_specs.htm) systems.