Yes this looks crazy. You will need a 5V 2 Amp power adapter to plug the cable into. When I purchased my battery powered WCO v1 cam over three years ago they all came with the 5V-2A power adapter and cable. This looks like everything is EXTRA.
I purchased a Battery Cam Pro along with a spare battery and a charging station. The charging station allows me to charge two batteries at the same time. The charging station is connected to a USB adapter. The camera comes with a charging cable and adapter in the box, If you choose, you can charge one battery by connecting the cable that comes with the camera directly to the battery therefore not needing the charging station. So in essence - you have options…