EEG cap with up to 32 channels: https://www.alibaba.com/product-detail/Greentek-Gelfree-S3-EEG-electrode-cap_1600503866992.html It runs only for two hours. If we want to use it as a long-term EEG cap or use it for sleep studies, we need to add water capillaries and a laboratory pump to each channel, to make it run endlessly. EEG board with 32 channel: https://www.aliexpress.com/item/1005002553363982.html?spm=a2g0o.cart.0.0.21313c00EvgW1g&mp= …
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