The ability to record brain signals during daily life activities would allow to deepen our understanding of the human brain, its related pathologies (such as epilepsy and Alzheimer’s dis- ease) or develop practical and discreet brain-computer interfaces. In this paper, we present a new miniature wearable electroencephalography (EEG) sensor, of which multiple copies can be de- ployed on the scalp in a wireless mesh configuration to record brain activity. Each node in this wire- less EEG sensor network (WESN) performs a local EEG acquisition which is transmitted via Blue- tooth low energy to a smartphone. To keep coherent signals over time and avoid drifting, the nodes exchange synchronization pulses within the WESN via human body communication.