Edimax Technology Wireless 3G Portable Router 3G-6210n - Manual (Page 18)

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Chapter II: System and Network Setup
2-1 Getting Started
Before you using the router, please follow the following instructions to
charge the router.
1. Remove the battery cover in the rear side of the router and insert the
supplied battery into the slot and then put back the cover.
2. Connect the power adapter to the wall socket, and then connect it to
the mini USB port of the router to charge the battery.