g.GAMMAcap² is designed for maximum comfort for the subject and fastest montage. The fabric used for this g.GAMMAcap² is very flexible, but robust. 74 labeled standard positions (based on the extended 10-20 system / 10-10 system) and 86 additional intermediate positions are precut for easy placement. This makes it easy to configure caps for certain experiments (e.g. P300 speller, SSVEP robot control, high-density brain mapping, etc.). The gel is inserted through the hole in the middle of the electrode. All types of active and passive electrodes can be changed / replaced if necessary. The electrodes normally stay inside the cap and are also cleaned with the cap. The big advantage is therefore the montage speed. 

g.GAMMAcap² is available in sizes:
 small: head circumference 50 - 54 cm 
 medium: 54 - 58 cm 
 large: 58 - 62 cm

g.GAMMAcap²KIDS is available in sizes:
 mini: head circumference 32 - 36 cm 
 midi: 37 - 43 cm 
 maxi: 44 - 48 cm

Size M fits for more than 95 % of adult subjects. Plain caps without labeling and cuts are also available. The caps can be used with a chest belt set or with chin straps coming with each cap.

g.GAMMAcap² uses active or passive g.LADYbird or g.BUTTERfly electrodes. The active electrodes are mounted with g.GAMMAgel without abrasion. The passive electrodes are mounted with abrasive gel.

g.tec's active electrodes are equipped with a touch-proof 2-pin safety connector and are plugged into g.GAMMAbox(es). A special adapter cable connects the box to the amplifier inputs. The passive electrodes are directly connected to the biosignal amplifier. g.GAMMAbox provides inputs for up to 16 channels. g.EXTENSIONbox is used to add more channels (32, 48, 64,...). The extension box has no GND and no REF socket, as only one ground and one reference electrode is used with this system.

With g.USBamp, the active electrode system can be used with external sensors on isolated input blocks.