Charge eight Cordless Microscopes with just one AC connection. The individual LED indicators show the status of the charge and the unit shuts off automatically when it senses the microscope is fully charged. The charger will also begin to re-charge the scopes automatically, when charge falls below 75%. You can also operate your microscopes while they’re charging. 3' 6" power cord. Size of unit: 7"L x 3"W x 2 1/2"H.