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In the headset could be placed two or three electrodes. The electrodes are placed at (left) C3, (right) C4 placement (placement above the ear, halfway to the center of the head) <ref name="HN2"/> resp. CZ (center of the head)<ref name="real world"/>. In contrast to other [[Transcranial direct-current stimulation|transcranial direct-current stimulation's]] devices the position of electrodes is settled. Electrodes can be removed, but not placed to any other location on scalp.<ref name="Halo is building"> LOMAS, Natasha. Halo is building a wearable to make athletes better, stronger, faster. TechCrunch [online]. 2016, May 9. Available online at: https://techcrunch.com/2016/05/09/halo-is-building-a-wearable-to-make-athletes-better-stronger-faster/ (Retrieved 10th November, 2016).</ref> Electrodes consist of foam spikes<ref name="jump higher"/> and they must be changed after three month's use.<ref> SAWH, Michael. Halo Sport headphones will zap an athlete's brain to train harder: Brain detecting wearable will prepare you for your next big session. Wareable [online]. 2016, May 10. Available online at: https://www.wareable.com/sport/halo-sport-headphones-zap-an-athletes-brain-to-train-harder-2691 (Retrieved 31st October, 2016). </ref> In addition, electrodes need to be wet before the start of every session.<ref>Halo Neuroscience. Do I need to wet my Primers before my Neuropriming session?. Halo Neuroscience Support [online]. Available online at: https://support.haloneuro.com/hc/en-us/articles/231523068-Do-I-need-to-wet-my-Primers-before-my-Neuropriming-session- (Retrieved 10th November, 2016).</ref>