This is a new design watch camera, why we say that? As old watch camera just can connect a small battery in the watch, so that the watch camera just can be used about 30 minutes when playing poker cards games, it is impossible to satisfy your requirement.
While now this kind of new design watch camera with big power bank can satisfy your battery life problem, the power bank can let this watch camera to work at least 3 hours, some big powerful power bank can work even much time. And you also can change another power bank to work with this watch camera.
As for this watch camera with power bank, it can work with all generations of poker analyzer and can scan all styles of bar-codes marking playing cards. And as for the distance of this kind of watch camera, we can make 6cm to 12cm; 20cm to 30cm and so on.