... AA size alkline battery or rechargeable battery 16-cnannel Multi-function EEGFeatures1. Multi-function all-in-one: Ambulatory EEG, BEAM, digital EEG, EEG ... and horizontally gauge, zoom and so on7. Complete function of EEG analysis and cases managementSpecifications Detecting channels:3 channels ... mm3Weight:(excluding battery) 50 g (battery is 11 g) Multi-function EEG monitor, AEEG, EEG monitor