waveguard connect: excellent choice for everyday EEG applications 21 active EEG electrodes, plus reference and ground Convenient connection to all EEG systems is achieved with optional adapters to individual 1.5mm touchproof connectors Coolmax breathable fabric for enhanced comfort and short drying times; easy to use and maintain Each head cap features 21 channels + reference & ground and includes a chin strap. Standard output is a DB25 connector. Electrode Type: Tin International 10-20 Electrode Placement Color Size Yellow Baby Red Infant Blue Child Yellow/black Small Red/black Medium Blue/black Large